Force of Law by Jez Morrow
When a Lamborghini Diablo car pulls into the quick oil change shop on Cleveland’s west side, Tom Russell immediately assumes this is his old lover, Wells, a beautiful, wealthy, east side snob, come back to torment him. But it’s worse.
The driver is Wells’ arrogant, obscenely rich cousin Law Castille, who invites Tom on a little subtle revenge, accompanying Law as his guest to Wells’ wedding. But dance with the devil, and there’s hell to pay. Tom thinks Law is toying with him, but Law’s visit to the poor side of a rustbelt town was never about revenge. It was never about cousin Wells at all. Law has come for Tom.