Robbers steal $1/2-million, throw it out the window during the getaway, and the suitcase of $$ falls on a dude's car.
Car owner is pissed about the denting of his wood-paneled station wagon's hood, but opens the suitcase and sees all the $$. He takes the $$ home to the wife -- and their lives seemingly improve.
Meanwhile the cops shoot one of the robbers and arrest the other one. He's held in jail while they figure out how to prove he stole the $$. So the robber's twin brother shows up and the robber tells him the money landed on a wood-paneled station wagon. Twin can have half the $$ if he can track it down.
Twin tracks down the couple, tells them if they give him back the remaining cash he'll let them go.
Then he tells them they have to pay back all they spent before he shows up ...
Yeah. You can see where this is going.
It was entertaining enough if you just don't think hard about much while watching it. There are worse movies out there, so avoid 'em and watch this one if you can't find anything else.