Showing Killshot by Elmore Leonard

Arman 'The Blackbird' Degas is a professional hitman: one shot, one kill. But when he's carjacked by ex-con Richie Nix, he finds himself with a lethal partner.

Nix is on his way to shake down a realtor and the Blackbird is along for the ride. But they don't count on Carmen and Wayne Colson getting in their way. Exposed as eyewitnesses, the Colsons are placed in witness protection but soon discover the program contains as many predators as the underworld they're hiding from. But can they outrun the Blackbird...?