Sleeping Dogs The Butcher's Boy Series, Book 2.

He came to England to rest. He calls himself Michael Shaeffer, says he's a retired American businessman. He goes to the races, dates a kinky aristocrat, and sleeps with dozens of weapons. Ten years ago it was different. Then, he was the Butcher's Boy, the highly skilled mob hit man who pulled a slaughter job on some double-crossing clients and started a mob war. Ever since, there's been a price on his head. Now, after a decade, they've found him....