In James Gray's deeply felt and intense crime thriller, set in 1986 New York, a naive engineer, Irwin accepts a seemingly lucrative business proposition from his brother, Gary, a former cop. But when Irwin witnesses something he wasn't meant to see at the Gowanus Canal, the brothers find themselves pulled into a dangerous confrontation with the newly emerging Russian mafia. As the threat of violence escalates, Irwin's wife Hester sounds the alarm, Irwin desperately tries to protect his family, and Gary is forced to make an impossible choice to save those he loves.