In London, 1908, Agnes Tower, who works at Gamages department store, finds her life about to change following an encounter with Harry Gordon Selfridge. He is finalising his great plans for the biggest and finest department store the world has ever seen in Oxford Street. His family also show up in London from Chicago. Word about the impending store opening begins to spread around London, and Agnes approaches Harry for a job. He remembers her, and agrees to give her a job. Opening day is a great success, attracting huge crowds but the takings are not brilliant.

The store has now been open for a few months and the displays are still as seductive as on opening day, and the staff are poised for action. The only thing the store is missing though is customers. Harry is confident though on the outside but privately he is worried. He goes to the country with Frank, where they wait in a field and then a flying machine emerges from the clouds and flies overheard. Harry manages to secures it for a grand exhibition in store.

Harry and Ellen are enjoying their new love affair and dance into the night at an apartment that Harry has got Ellen. She ends up talking about her father and reveals that her real name is Joyce. Agnes's nasty drunk father called Reg has been fired from his job and he ends up losing his temper with his daughter, hitting her across the face.

Harry scores something of a coup when prima ballerina Anna Pavlova agrees to pay Selfridges a visit. However, Agnes's job looks to be under threat when a violent Reg reaches breaking point and gatecrashes the event - and things only get worse when Ellen invites herself along. Meanwhile, one of the department store's most loyal employees is caught stealing, a formidable new head of fashion arrives and Rose reveals her true identity to Roddy.

Harry delights in a new car brought in for a window display, but after a confrontation with Rose, who has received a visit from his mistress Ellen Love, he hits rock bottom, drinking and reliving a traumatic childhood memory as he drives the vehicle into the night. Meanwhile, Agnes falls out with Victor when she returns to Selfridges, although Henri is pleased to see her again.

Harry is left unconscious after the car accident and as his family gathers by his bedside, the news arrives that Mrs Grove is dead - something which leaves Miss Mardle confused. Meanwhile, a suffragette demonstration in the area sees all the store's staff pulling together, and as Victor and Lady Mae conduct their secret affair, Agnes and Henri's friendship continues to grow.

Author and spiritualist Arthur Conan Doyle is in Selfridges for a Sherlock Holmes book signing when he persuades Harry to hold a seance in the store - and the results of the gathering force the retail magnate to have a long-overdue heart-to-heart with Lois. Meanwhile, Agnes is transferred to women's fashion, Doris resolves to help an old friend, Miss Mardle is still agonising over Mr Grove, and Kitty has a secret admirer.

Harry and Rose are getting ready to host a dinner in honour of friends Frank and Jennie Woolworth. Frank is a fellow American retail tycoon and founder of the famous High Street chain. A Woolworth’s store is about to open in Brixton, and when Frank thinks of a possible West End branch, Harry’s feathers soon become ruffled. Lady Mae wants to introduce young Rosalie to some eligible young Society men. Kitty and Doris vie for the vacant position of Senior Assistant in Accessories and are interviewed by Mr Grove. Ellen Love makes a surprise visit to the Palm Court, with Tony Travers on her arm. Victor has a proposition for Lady Mae.

Antarctic explorer Ernest Shackleton arrives to give a lecture at the store. On the same day, the underground is shutdown when a body is discovered on the tracks, resulting in the late arrival of several employees. The identity of the body sends a wave a shock throughout the store. Meanwhile, Frank Edwards is disappointed when he needs a favor, and Roddy Temple's presence continues to cause problems.

Lady Mae arranges an after hours shopping spree for King Edward VII. To thank Harry, the King invites the Selfridges to the opening of Ellen Love's new play, much to Rose's dismay. The Selfridges and Lady Mae discover the play is a satire aimed at ridiculing them, and scripted by an embittered Frank Edwards. Ashamed and humiliated, Rose takes the children back to America. Meanwhile, wedding bells will soon be ringing for two of Selfridges' own.

Five years since the store's opening, business is booming for Harry and new faces have joined old favourites at Selfridge's. Rose makes a surprise return home with a mysterious new friend in tow, Lady Mae is forced to deal with troublesome husband Lord Loxley who arrives in town from the country, and Agnes returns from a creative secondment in Paris - but is Victor pleased to see her?

Rumblings of war and social unrest inspire trades union activists to target Selfridge's. Harry responds by throwing a tango party to thank the staff for their hard work. He also wants to do something more public and asks Agnes to organise a Celebration of Empire in the store - but is it too much for her? Meanwhile, Rose secretly seeks out an old friend for Harry, and trouble is brewing for Lady Mae.

Agnes is working through the night getting ready for the Empire Exhibition that Harry is rolling out across the store. Mr Crabb attempts to cover for Mr Grove after Harry thinks that he’s late for work again. Harry receives a visit from Henri and takes the opportunity to apologise and asks him to return to work. Gordon is fed up with the frostiness between his parents. Miss Mardle asks Grove to meet her at her new address and he finds out that she has inherited a beautiful London home and income from her brother. Lady Mae manages to find out that truth about Loxley’s finances and discovers that he has gambling debts and is rumoured to be all washed up.

With news of the first horrors of war in Belgium, the men of Selfridges clamour to sign up, while Rose, Delphine and Lady Mae organise a special chocolate sale to aid refugees - which goes down a treat in the store and proves inspirational for Miss Mardle. Thackeray suspects Henri is up to no good, Victor faces a family crisis and Loxley gets his shady money-making plans off the ground.

With so many of the men signing up for duty, the women are now working in the loading bay and struggling to adjust, while Harry yearns to do more for the war effort, so Delphine introduces him to several senior government figures who could help. Crabb organises rifle training for the staff, Thackeray's anxieties about Henri reach a new level and Miss Mardle entertains a surprising house guest. Lord Loxley suddenly seems to be in the money, much to Lady Mae's concern.

With German goods being taken off the store's shelves, Harry organises a patriotic concert to raise money for British troops, and Lady Mae arranges for an old friend to headline the event. However, Harry has also offered to help the government, and just as the gig is about to begin, he's ordered to leave London on a secret mission to Berlin. Elsewhere, Agnes and Victor find themselves going over old territory and an increasingly paranoid Thackeray takes action against Henri.

Following Henri's arrest and Harry's disappearance, everyone is in a state of confusion and the police arrive at the Selfridges' home in search of clues. However, when Rose discovers her husband is away on secret government business, she's more worried for his safety than ever before. Meanwhile, Agnes receives an ominous telegram, Lady Mae has to make a tough decision, and will Loxley get his comeuppance?

Harry deals with a raft of problems on his return from his secret government assignment - not least the news of Henri's arrest. Coming to his employee's aid, Mr Selfridge pulls a few strings and calls in a favour to get him out of custody. Meanwhile, the beleaguered staff receive a much-needed morale boost when Delphine arrives at the store accompanied by Hollywood producers and actresses, and Lady Mae decides it's high time she cut her ties with Loxley.

After recent ructions, Harry is more determined than ever to get Selfridges back on track and asks Delphine to organise a special event in the store.

Harry is desperate to clear his name, Victor and Agnes endure some painful soul-searching when a loved one returns, and Miss Mardle grapples with a romantic dilemma.

It is now 1919 and the war is over. After losing his beloved wife, Harry and his family look forward to a happy family event - his daughter Rosalie is to be married.

While Harry decides to pursue a new charitable project, Crabb is faced with a massive professional dilemma. Agnes faces an unexpected challenge very close to home.

Harry goes ahead with his plans for the estate, buying a field at auction - only to find there is an unexpected rival bidder. Henri continues to behave erratically.

Harry and Nancy bring the injured Kitty to hospital, whilst Frank rushes to be by her side.

Harry and Nancy are enjoying the passion of their romance, having been together secretly for a while now. But as always, Harry has business to attend to.

Harry places Violette under house arrest after the police raid at Colleano’s.

Harry offers his support when a situation sends ripples through the Selfridge’s staff and Mardle attempts to maintain composure but struggles with the weight of her secret.

To celebrate the signing of the landmark Treaty of Versailles, Harry consults his newly appointed Head of Press and Print on a way to mark this moment in store, who is none other than old friend Frank Edwards.

Harry holds the biggest flash sale in the store's history, taking a massive gamble in the process. Nancy finds it difficult keeping her engagement from Gus.

Harry and Lord Loxley clash in a dramatic confrontation. Princess Marie probes into the status of the Selfridge Estate. Gordon faces a big romantic decision.

It's 1928 and nine years on, retail magnate Harry is enjoying his time at the heart of the Roaring Twenties. In store, while about to unveil a new monument he receives a very special visitor - though a later accident places his role at the helm in jeopardy. Elsewhere, Mr Grove celebrates his birthday in the company of his now 19-year-old daughter Meryl, and store favourite Kitty Edwards is keen to show off her luxurious new abode - while her sister Connie has some exciting news.

Following the Queen of Time unveiling accident, Harry recovers at his country home. However, keen to quash any retirement rumours, he returns to the store at the earliest possible moment intent on opening a cutting-edge technology department, and soon annoys Mae when he insists on a role for the Dolly Sisters at her first-ever fashion launch. Kitty is soul-searching after Connie's news gets around the store, while mysterious entrepreneur Jimmy Dillon starts to make his mark on Harry - not to mention Mae.

Despite his loss, Harry pretends that it is business as usual and is happy to be distracted by new belle Rosie Dolly. Kitty is nervous to meet her role model, cosmetics icon Elizabeth Arden, who is opening an historic concession in the store. Following a fall, Grove contemplates retirement and buys the family's first motorcar, while the launch of a joint venture between Jimmy and Harry leaves Gordon simmering.

After the huge success of the Selfridge Trust, Harry whisks a large group of journalists abroad to Biarritz for a typically decadent roaring twenties affair, which soon manages to get a little out of hand. Nevertheless, the retail magnate uses the occasion to announce that the Selfridge group has purchased a raft of new department stores across Britain. Meanwhile in London, the staff are preparing for a special visit by celebrated writer AA Milne, and Grove determines to continue with life as normal, until he gets a blast from the past.

The ground floor of the department store is transformed into a movie set, as Double Trouble starring the Dolly Sisters and famed-actor Bumby Wallace is filmed. Harry is delighted to be the source of excitement throughout London once again, as Grove and Mardle attempt to grapple with their past - and their future. Kitty comes to a horrible realisation, and Mae reconnects with old-flame Victor. Meanwhile, Harry's mistakes catch up with him in dramatic fashion.

Reeling from the bad publicity after the assault on the store, Harry finds himself forced to admit the true state of his financial affairs when D'Ancona piles on more pressure, and later finds himself embroiled in a costly spat with media magnate Lord Wynnstay. Mr Grove and Miss Mardle plan their very special forthcoming event, and Meryl enlists Tilly's help for a very important task - fuelling Miss Ellis' ire in the process. Mae and Victor grow closer, leaving Jimmy to become increasingly jealous.

Harry determines to get his life and the store back on track, and returns to what Selfridge's does best - a classic, store-wide summer promotion. However, he still has to contend with the disruptive antics of Lord Wynnstay, while a guilt-ridden Jimmy hides behind a daring new business proposition. Despite her grief and shock, Mae's new ready-to-wear summer collection proves a runaway success as Kitty's time at Selfridge's comes to a poignant end. Drama, starring Jeremy Piven, Sacha Dhawan and Katherine Kelly.

Harry, Gordon and Jimmy publicly announce the purchase of Whiteley's, claiming it to be an exciting project that will cement the future of the Selfridge legacy. However, while later helping out Crabb with the Whiteley's accounts, Harry makes a worrying discovery. Grove is forced to admit it's time to retire, while Meryl makes a stand to her father in order to get Tilly reinstated. Jimmy starts to arouse suspicions when questioned about Victor, and a sudden tragedy sends shockwaves through the store.

As preparations are made to celebrate the store's 20th anniversary, Harry works tirelessly to break the suppliers' embargo on Whiteley's, while Mae manages in avoiding him. A stoic Mardle struggles to cope, and Meryl steps in to provide some much-needed help. Jimmy's accountant reveals a massive problem, which leads to a very risky and secret plan, while journalist Joe Tooby continues to investigate him - with shocking results.

Harry's judgement, Whiteley's and even Lady Mae's love life are now all under the spotlight of a tabloid frenzy. Jimmy's final act has Harry reeling and the retail mogul retreats from the publicity for the sanctuary of home. Mae, now at the end of her tether, contemplates her future in London. The threat of a trade embargo imposed by Hardcastle sees acting boss Gordon backed into a corner, and Harry called to account.