Elmore Leonard: Unknown Man # 89 (UK 2006)
From the Publisher:
Tough guy jack Ryan goes looking for a missing lowlife and finds himself in a whole lot of trouble...
Motor city process server and ex-thug Jack Ryan is very good at finding people - especially people who don't want to be found. now he's being offered large bucks to locate a lost lowlife named Robert Leary, aka Bobby Lear. But this hunt is leading Ryan back into very bad company - and into beds where he doesn't belong. Then suddenly he's on someone's hitlist for some undisclosed reason, with all the big money numbers adding up to double-cross. And if Jack doesn't watch his back, he's going to find himself missing... permanently.
Elmore Leonard: Unknown Man # 89. Phoenix, ISBN: 0753819651 (March, 2006), 272 p., £6.99.