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. 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.