Once were cops
(Book)

Michael O'Shea is a member of Ireland's police force, known as The Guards. He's also a sociopath who walks a knife edge between sanity and all-out mayhem. When an exchange program is initiated and twenty Guards come to America and twenty cops from the States go to Ireland, Shay, as he's known, has his lifelong dream come true--he becomes a member of the NYPD. But Shay's dream is about to become New York's nightmare.