Strip Jack (Inspector John Rebus Series #4)

Gregor Jack has it all: young, wealthy, and charming, he's a highly respected member of Parliament, with a  beautiful wife—and a closet bursting with skeletons.  When he's caught in a police raid on an Edinburgh brothel, his house of cards begins to topple.  Enter Detective John Rebus: he smells a set-up.  When Jack's flamboyant wife Elizabeth disappears, Rebus uncovers a full-house of orgies, drunken parties, an incestuous "Pack" of deceitful chums...and ultimately Elizabeth's badly beaten body.  Now Rebus is on a new quest—to find a killer who holds all the cards. 

Strip Jack is a stellar entry in Ian Rankin's series, which The New York Times calls "A superior series."