1998 - Bihar is going through a financial crisis and caste wars are rampant throughout the state. Dileep Ram, a Dalit, is killed by Thakur Saheb, a landlord because Dileep refused to send his wife to work at Thakur's mansion. In reprisal, Naxal leader Shankar Mahto kills Thakur along with eight of his men. This leads to political unrest in Bihar and brings the factionalism in the ruling party out in the open.

CM Bheema Bharti survives the fatal attack but is bedridden. RJSP central observer Ramjeevan Bohra informs Bheema that due to his ill health, the party has decided to elect a new CM. Bheema agrees to resign with a condition that if he gets maximum votes then he will announce his successor and Bohra agrees. A triangular fight ensues between Bheema Bharti, Naveen Kumar and Party President Gauri Shankar Pandey.

Illiterate and shy Rani Bharti is completely out of depth while taking CM's oath in cabinet meeting. She feels extremely humiliated as media roasts her and calls her rubber-stamp CM. She decides not to go to the office but when Bheema's PA Mishra Ji reminds her that her reluctance to take charge as CM could lead to another murder attempt on Bheema, Rani gets the message. She orders DGP to find people who were behind murder attempt on Bheema.

CM Rani Bharti faces the first big crisis in the office when Veer Sena, an army of upper-caste people, massacred 37 lower caste people in Laxmanpur village. Rani Bharti gives a 13-day ultimatum to DGP to catch Mukhiya. DGP nabs Mukhiya's right-hand man Kunwar Singh in a daring operation but he refuses to divulge Mukhiya's whereabouts. Meanwhile, Rani gets to know from Finance Secretary Parvez Alam that the state has no money to even pay its employees and all state treasuries are empty.

Ranchi DM Manak Gupta pays a visit to Machan Baba, a religious leader, and informs him about the Finance Secretary's visit to Ranchi treasury for audit. Machan baba asks him to be alert. Parvez Alam and his Deputy Anjani Srivastav visit the treasury office in the night and find suspicious bills. Parvez reports to CM Rani that Animal Husbandry Dept (AHD) has done fraudulent withdrawals in millions from Ranchi treasury. CM orders him to investigate AHD withdrawals from all 48 treasuries of Bihar.

Parvez Alam interrogates 4 AHD officials of Ranchi and gets to know withdrawals were done by submitting fake bills of supply of seeds, fodder, medical equipment by companies such as VC Foods. He also gets to know fraud was happening with AHD minister Prem Kumar's approval. Rani confronts Prem and asks for his resignation. Prem reminds her that if he goes, her govt will fall too.

Mukhiya with help of SP Nishikant traps and kills ASI Ranjana Kumari, a Naxal sympathizer, who had helped DGP to arrest Kunwar Singh. Shankar Mahto vows revenge. Rani Bharti dismisses Prem Kumar and orders CID investigation into the scam. Infuriated Prem Kumar, on the advice of Gauri Shankar Pandey, leaves RJS party and joins hands with Naveen Kumar along with 8 more MLAs from RJS on the occasion of Makar Sankranti. This brings Rani's Govt into a minority.

Bheema, who could now walk with the help of a stick, meets Governor and asks him why did he try to kill him? After all, Machan baba couldn't do anything without Governor's approval. Governor reminds him that he had gone back on his words. Bheema offers Governor a deal - that he won't touch Machan Baba and in return, Governor won't call Rani Govt, which was in minority, for floor test as demanded by Naveen. Bheema, true to his word, stops Rani from arresting Machan baba.

Rani meets Governor at midnight and demands an explanation. Governor drops a bombshell, tells her Bheema Bharti too was part of the Seed Scam. In fact, 3 years ago, post elections, his party RJSP was short of a majority in the Assembly and Bheema became CM only after he agreed to make Virender Thakur, Governor Protege, and Animal Husbandry Minister in the previous govt, as AHD minister in his government too.

Rani confronts Bheema about the scam, death of Virendra Thakur and his association with Naxal leader Shankar Mahto. Bheema says Virender had joined hands with Mukhiya to kill backward caste people and destabilize his govt, so he asked his college friend Shankar Mahto to kill him. Later he made Prem Kumar as AHD minister with approval from Governor. Bheema adds he did nothing wrong as these are small prices to pay for the social change he brought in Bihar.

Eight months after Rani sent Bheema Bharti to jail from the Assembly floor and promised a fair and transparent administration to the people of Bihar, she is struggling on both personal and professional fronts. Bheema runs a proxy government from jail and there is lawlessness in Bihar. When a young girl is raped and murdered, the opposition dubs Rani's government as Jungle Raj and demands her resignation.

As Rani takes steps to get rid of the Jungle Raj in the state, her own party's MLAs rebel against her. Meanwhile, Naveen Kumar meets Govardhan Das to discuss their next move.

RJSP, the ruling party, elects Musafir Baitha as the CM designate. Rani and Naveen eye Jharkhand Jan Party leader Ekkal Munda's support to prove a majority. Bheema walks out of jail and asks Rani to resign. Rani's political move stuns not only her husband but the opposition too.

Anti-reservation bill protests break out on the streets. Naveen plans to counter Rani's political move. Bheema sees an opportunity in this political turmoil to gain political mileage in Bihar.

Violence erupts and spreads throughout Bihar. Rani imposes Section 144 in the state and orders Naveen's arrest. Ex-Governor Govardhan Das returns to Bihar to investigate the violence. Prem Kumar, out on bail, makes a revelation, which breaks Rani's heart.

The word of Bheema's love interest gets out to the media while Rani struggles to accept her new reality. Bheema launches a new political party as the elections are announced. Govardhan discloses the truth behind the Siwan violence and Bheema being bombed to Rani.

People cast their votes in the elections. Who will Bihar choose as its next chief minister? Rani, Bheema or Naveen?

Suspense on the formation of the government continues while Naveen brings Bheema an exciting proposal. Bheema throws a Holi party and invites newly-elected MLAs from the RJSP and BVP parties to form a government.

Martin Ekka is appointed as the head of a three-member committee to investigate Bheema Bharti's unexplained death. President's rule is imposed on the state. Mishra decides to unravel the mystery by himself. A new light shines on the case when the committee investigates all the MLAs present at the Holi party.

Govardhan Das is reappointed as the Governor of Bihar and calls the single largest party, BPP, to form the government. Martin meets Rani to tell her the truth behind Bheema Bharti's death.

Rani Bharti has spent three years in jail without a trial, while CM Navin Kumar has become popular after introducing liquor ban in the state. The high court hands over Dr Sinha's son Manoj Sinha's murder case to the CBI; however, Dulari Yadav, the main accused is found dead.

Dulari Yadav's unexpected demise sends shockwaves through Navin's cabinet, breeding mistrust amongst them. Kalanaag, frustrated with the treatment meted out to him by the chief minister, brews a plan to malign Navin's government. Meanwhile, Rani's children are shot at outside the school.

Rani, out on bail, gives a ticket to Dulari's widow, Saroj Yadav, from the Sargunia seat against Kirti Singh, who is the CM's candidate. However, Saroj Yadav loses the bypoll election after news comes out that Rani herself ordered the hit on her kids.

Kalanaag meets Veer Sena Commander Kunwar Singh and convinces him to sell fake liquor in the state. Martin Ekka is investigating Kirti's husband Sunil Singh's murder and reaches the doorstep of truck driver Mahendra Rai, who is absconding, in Siwan some 100 people die after consuming spurious liquor.

CM Navin Kumar blames Kunwar Singh and raids his hideout. Dilshad Mirza's right hand man, Iliyas, is kidnapped and, on camera, he confesses to running the biggest liquor syndicate in Bihar. Rani confronts Navin in the Bihar Assembly and demands his resignation.

As Sanyasi Rai posts bail, Rani vows to bring down Navin's government and decides to celebrate the Sama-Chakewa festival. Meanwhile, Martin and Mishra confront Mahendra Rai, out on bail, and learn the truth behind Sunil Singh's murder.

Navin is forced to resign as Chief Minister after the double murder and Makhdoomabad hooch tragedy, and announces Kirti's Singh as his successor. The investigative report for both the cases submitted by the Bihar Police reveals a shocking truth.

A series of events compels Musafir Baitha to change his mind. When Navin asks him to step down from the Chief Minister's post, he refuses as Rani extends her support to him.

Maharani Season 4 opens in 2012 as PM Sudhakar Joshi's coalition nears collapse after losing West Bengal CM's support. Joshi's aide seeks Bihar CM Rani Bharti's backing, but she refuses. As Rani asserts her leadership in Bihar, Joshi allies with her jailed rival, Naveen Kumar, to undermine her. Soon, a commission report implicates Rani in an old murder case, triggering a CBI probe. The episode ends with a charged face-off between Rani and Joshi, setting the stage for a fierce political war.

Rani Bharti resigns as Bihar's CM after rejecting the Maheshwari Commission's allegations, declaring she will take her fight to Delhi. Her son Jai's growing ambition clashes with the old guard of Rani's party like S N Mishra and Kaveri. Meanwhile, Joshi manipulates Tamil Nadu CM Sunderraja to not switch sides and remain in his coalition. CBI arrives in Patna to arrest Rani, but she secures anticipatory bail. The episode ends dramatically as Rani names Roshni Bharti the new CM.

There is heavy backlash over Rani Bharti's decision to appoint her daughter as Bihar's CM. Party veterans like Kaveri and Mishra openly question the move, accusing Rani of promoting dynasty politics. As PM Joshi runs a social media campaign called #NangaNepotism against Rani and Roshni, tensions rise. Roshni soon faces funding cuts from the Centre, testing her leadership. In a fiery Assembly speech, she boldly challenges PM Joshi proving, she's more than just Rani Bharti's daughter.

The political storm deepens as PM Joshi targets Rani Bharti's family through a coal-mining deal linked to her son Jai. While Rani seeks alliances in Tamil Nadu to counter Joshi, he cunningly manipulates Kaveri - sending her to the UN. Distrust brews within Rani's camp as Jai clashes with Roshni over his business ties with Rishi Agarwal, and Kaveri begins doubting Rani's motives. When Kalanaag warns that Kaveri's betrayal is imminent, Rani is forced to choose between loyalty and survival.

Kaveri represents India with a powerful UN speech as Rani and Roshni tighten control in Bihar, cancelling all Akshanta Group contracts tied to Jai. This sparks a family confrontation, leading Rani to placate an angry Jai and enlist him for Delhi's political battle. PM Joshi counters Rani's growing alliance against him by framing CM Sunderraja's family in a scandal. As Rani unveils her new opposition front - Rashtriya Jan Sammaan Morcha - Joshi's sabotage forces Sunderraja to leave her coalition.

The personal and political turmoil in Rani Bharti's world deepens. Jai seeks Aditi's hand, but Balmukund's acceptance comes with a secret condition that could shake Bihar's power structure. As Rani tries to unite allies, Kaveri warns her that Jai is entangled in a coal scam. Kalanaag manipulates Mishra and fuels divisions within Rani's circle. Just as Rani begins to steady her ground, the CED arrests Jai from his own engagement, and PM Joshi dissolves Parliament, calling early elections.

Jai is forcibly brought to Delhi by CED for questioning over alleged money laundering linked to coal block deals. Despite harsh custody conditions, he resists pressure to admit to the charges. Meanwhile, Rani and Roshni uncover Skyron corruption, tracing illicit payments to Nachiket. Jai is granted bail, and Rani nominated him as a candidate in the upcoming elections. Jai exposes Joshi's financial scandals publicly and reveals that Nachiket is the illegitimate son of PM Joshi.

Election results end in a hung parliament, plunging Delhi into chaos. Rani prepares to stake claim for power, but betrayal brews within - Kaveri and Mishra rebel, splitting the RJSP. Meanwhile, Jai's secret dealings spiral into tragedy, shaking Rani's world to its core. As Joshi triumphantly returns as Prime Minister, Roshni is arrested, and Bihar slips from Rani's grasp. In a searing final confrontation, a shattered Rani vows vengeance, promising to uncover the truth at any cost.