Corcoran closes in on the parties responsible for the kidnapping and murder of young Five Points men. As the pressure to capture the culprits grows, he is forced to choose between fealty to the badge and loyalty to loved ones. Francis Maguire embraces his new position in the underworld, rapidly climbing the ladder of New York City's criminal elite. Robert Morehouse and Elizabeth Haverford exchange vows – though the evening will prove to be nothing like either anticipated.

Five Points falls into a state of panic as a community safe haven is seized by one of the deadliest men in New York City. With both coppers and civilians at the mercy of a brilliant but unstable force, Detectives Kevin Corcoran and Andrew O'Brien, with Doctor Matthew Freeman and several coppers, race against time to restore peace to the Sixth Ward. As the coppers defend their home against an unrelenting foe, Francis Maguire sees an opportunity to settle a score with Corcoran.