Fingers (George Cole) and his gang of criminals (including Sid James and Bernard Bresslaw) have the reputation for being the most dim-witted crooks London has ever seen.
Fingers, however, has a plan - to rob tight fisted, loose-living millionaire and tax dodger Billy Gordon (Terry Thomas) of his cash. The incompetent gang meet one failure after another and decide to change tack and kidnap Gordon's beloved daughter.