By 2:27 on a Thursday afternoon, the one-legged man from Room 8 at 147 Loxitor Avenue has been beaten to death with a lead pipe. Twenty-eight minutes later, Detective Mike O'Shea is testifying in a stuffy courtroom, unaware that, within an hour, he will be standing in an alleyway littered with beer cans and condoms while his new partner-the man who saved his life thirteen years ago-flicks bugs off of a battered corpse with a ballpoint pen. When a...