2:00 a.m., the day after Christmas, and Detective Erin O'Reilly is ready for the biggest bust of her career. After months of deceit, danger, and death, Erin and her task force are in place to make a clean sweep of Evan O'Malley and his gang. But when the operation goes sideways, all their carefully-laid plans collapse into chaos.

A close friend and co-conspirator is shot in his kitchen. A ruthless O'Malley enforcer is on the loose and bent on revenge. Everything Erin thought she could count on is going up in smoke.

With a key witness at risk and new power struggles already simmering, Erin and her K-9 Rolf race through the dark Manhattan streets on a mission to finish off the Irish Mob. As bullets fly and buildings burn, gangsters, cops, and traitors hunt each other in the twilight of New York's concrete canyons. The O'Malleys' day may be ending, but they're not going down without a fight.