Harry Agenshy is a retired boxing champion (Douglas) who lives with his son Moses. When his estranged son Lance (Aykroyd) has a rough time with his own son (Allred), Harry convinces them to drive out to Las Vegas in search of 13 diamonds he hid long ago after being paid off for losing a fight.
Lauren Bacall makes an appearance as the madam of a Nevade whorehouse.