A woman investigates the mystery of what happened on a certain Sunday if her life that she has lost all recollection of.
Sehar's (Ayesha Takia), world is turned upsidedown when she gets a clue about the missing Sunday of her life, which points to a possible violent attack on her.
Then A.C.P Rajveer (Ajay Devgan) takes up the mantle to sort out the complicated and jumbled up threads of Sehar's life. Rajveer tries to be an honest cop and his honesty contributes to encouraging a total ban on any criminal activity by the locals.
In the process of solving Sehar's case it comes to light that on Sunday, different people interacted with Sehar and amongst them, one could be the accused.
To name some, the lot includes 'Ballu' (Arshad Warsi), the taxi driver and his friend Kumar (Irrfan Khan), a struggling NSD actor, Ritu her close friend, a scary and suspicious character who resides in Sehar's society, and the group whom she had come across while partying at the discotheque.
Starring: Ajay Devgan, Arshad Warsi, Ayesha Takia, Irfan Khan, Mukesh Tiwari
Sunday is released 1st February.