The Silent Partner (1978)

THE SILENT PARTNER stars Elliott Gould as Miles Cullen, a teller who gets wind of master criminal Harry Reikle's (Christopher Plummer) scheme to rob his bank. Cullen providently squirrels away $50,000 in a safety deposit box before Reikle strikes. After the robbery, the papers report the amount of the bank's loss. Reikle realizes that there's fifty thousand extra bucks floating around that he hasn't gotten his hands on. The soft-spoken but sadistic Reikle puts the screws on Cullen to fork over the dough...but Cullen has lost the deposit box key.