A career bank robber, Jack Foley, and a U.S. Marshal, Karen Sisco, are forced to share a car trunk during Foley's escape from a Florida prison. After he completes his getaway, Foley is chased by Sisco while he and his friends—right-hand man Buddy and unreliable associate Glenn—work their way north to Bloomfield Hills, a wealthy northern suburb of Detroit. There they plan to pay a visit to shady businessman Ripley, who foolishly bragged to them in prison years before about a cache of uncut diamonds hidden in his home.
A vicious criminal named Maurice Miller, who also spent time in jail with Jack and Ripley, is planning on hitting up Ripley's mansion with his own crew, including Kenneth and White Boy Bob. A romantic interlude between Foley and Sisco takes place in a Detroit hotel, but the question of whether she is really pursuing Foley to arrest him or for love ends in a showdown during the robbery at Ripley's home and adds to "the fun" Foley claims they are having.