Shaw is a detective who returns to active duty after a time of low, which has been caused by the death of its companion. Upon returning, he discovers something he does not like.
Investigating the death of his companion discovers the worst thing he could discover, which is that his companion was killed by other policemen of the body he knows. These policemen realize that he has discovered them, so they have to cover up evidence.
For this, the first thing they have to do is get rid of Shaw, the only one that can link them to the murder. In this way, they have a trap to accuse him of the death of his partner.
Now, Shaw is locked in the police station with his full magazine, which he will need to get rid of the comrades who want to blame him, who may decide to kill him at any time.