Bed of Nails by Sian Reynolds
It's as if he's being mocked from beyond the grave...When John Nichols arrives to identify the body of an old friend, he is instantly caught up in the wreckage of Alan Mustgrave's life. This is the side of Paris the tourists don't see, where everyone has a past but very few count on a future. But what can he expect from a man who bled to death in his own S&M show? Now there's a maverick police lieutenant on the prowl who thinks that Mustgrave was murdered. As the horrific extent of police abuse is revealed, the race is on to find the link between a slew of apparent suicides - and the key to it is buried deep in Nichols' past.