Envy the night - Michael Koryta

It's been seven years since Frank discovered his father's dark secret: that he was a U.S. Marshal, a contract killer who committed suicide to avoid prosecution. Now Devin Matteson, the man who betrayed his father - drawing him into the killing game and then handing him over to the FBI - is coming home to the Wisconsin lake that was once hallowed ground for both families. But this is a homecoming Frank knows he cannot allow.

But when Frank arrives at Matteson's old cabin he finds only a strange, beautiful woman and a nervous man with a gun; Matteson is nowhere to be seen. When a pair of deadly assassins arrive on the scene, the sensible thing would be for Frank to contact the police, but Frank's father was nothing if not a good teacher, and his son a willing pupil . . .