Ab Tak Chhappan film begins with Mumbai Police Inspector Sadhu Agashe walking on the beach. He narrates how he joined the police force in 1985 and kept mostly to a desk job for the next nine years.

Sadhu Agashe began his career with the Mumbai police several years ago and was initially asked to work at a desk job, writing up First Information Reports, and never got to use his gun. Then he was promoted to the plain-clothes crime branch division, and that's when he stopped writing reports and started to use his gun. He heads a team of four outstanding officers, who obey him without question. When Police Commisisoner Pradhan retires, his position is taken up by M.I. Suchek, who dislikes Agashe.

Soon, Agashe becomes a target of inner politics, his wife gets killed during a wedding ceremony, and he himself gets arrested by none other than his subordinate, Imitiaz Siddique, who has been asked to kill Agashe in a sting. The people participating in this killing are none other than Agashe's subordinates - the very ones he had trained to kill and obey orders without question