Antony Varghese (Mohanlal) is a police officer who has been sent to a school as a teacher in disguise, to get details about the notorious Roy Mamman(Nassar(actor)) who is behind terrorist attacks in the city. Antony knows Roy Mamman's child is studying in that school, but he does not know which of the kids is Mamman's. During his investigation he meets Angel Mary (Meena Durairaj), a teacher, and attracts her enmity. Antony discovers that Angel has a troubled past with her husband turning out to be a drug addict, thus spoiling her marriage life on the first day. Antony later falls in love with her.