Detective James Knight is in the middle of an escape led by the Christmas Terrorist. Promising to return his badge in exchange for taking down the terrorists, he decides to give mercy to the righteous - and merciless justice to others.

With his gangster boss on trial for murder, a mob thug known as "the Teacher" tells Annie Laird she must talk her fellow jurors into a not-guilty verdict, implying that he'll kill her son Oliver if she fails. She manages to do this, but, when it becomes clear that the mobsters might want to silence her for good, she sends Oliver abroad and tries to gather evidence of the plot against her, setting up a final showdown.

As Los Angeles prepares for Halloween, mask-wearing armed robbers critically wound detective James Knight’s partner in a shootout following a heist. With Knight in hot pursuit, the bandits flee L.A. for New York, where the detective’s dark past collides with his present case and threatens to tear his world apart…unless redemption can claim Knight first.