Celtic Twilight (The Erin O'Reilly Mysteries #25)
Steven Henry

2:00 a.m., the day after it’s a dark, wet night, and Detective Erin O’Reilly is ready for the biggest bust of her career. After months of deceit, danger, and death, she’s going to take down the O’Malley gang. All the pieces are in place. Evan O’Malley won’t know what hit him.
But something goes wrong. Erin’s friend, a Mob informant, is shot in his kitchen. A deadly O’Malley enforcer disappears. Erin’s carefully-laid plans collapse into chaos. As bullets fly and buildings burn, Erin and her K-9 Rolf race through the dark Manhattan streets on a mission to finish off the Irish Mob. Gangsters, cops, witnesses, 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.