Sehar's (Ayesha Takia) world turns topsy-turvy when she gets a clue about the missing Sunday of her life, which points to a possible violent attack on her. A.C.P Rajveer (Ajay Devgn) takes up the case to sort out the complicated and jumbled up threads of Sehar's life. In the process of solving Sehar's case, he discovers that on Sunday, different people interacted with her and amongst them, one could be the accused. The lot included Ballu (Arshad Warsi), the taxi driver and his friend, Kumar (Irrfan Khan), a struggling NSD actor, among others. While trying to solve the puzzle, Rajveer stumbles upon a murder case whose clues hold up Sehar to be the culprit.