Teesri Begum is an emotional social drama centered on Pooja Dixit, a naïve young woman trapped in a toxic marriage with the manipulative Babban Khan. Rejected by her grieving parents and suffocated by Babban’s oppressive control, Pooja longs to reclaim her freedom. Tabassum, who has endured a similar fate, becomes her source of strength and hope. The tragedy deepens when Pooja’s father, respected principal Deena Nath Dixit, dies from the emotional shock surrounding her life. Disturbed by the injustice, Babban’s stepbrother Yusuf stands against his family. With secret help from Shabana, Pooja and Neetu attempt to escape and rebuild their lives with courage and dignity.