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.