Showing Out of Sight by Elmore Leonard

Jack Foley was busting out of Florida's Glades Prison when he ran head-on into Karen Sisco with a shotgun. Suddenly the world-class gentleman felon was sharing a cramped car trunk with a disarmed federal marshal - whose Chanel suit cost more than the take from Foley's last bank job - and the chemistry was working overtime. Here's a lady Jack could fall for in a big way, if she weren't a dedicated representative of the law that he breaks for a living. And as soon as she escapes, he's already missing her.

But there are some seriously bad men and a major score waiting for Jack in Motown. And there's a good chance that when his path crosses Karen's again, she's going to be there for business, not pleasure.