Harrison Fell is an ad executive that needs to come up with an ad campaign to sell the 801 Burglar-Proof safe. Harrison invites the press and a notorious safe-cracker Sammy Morrisey to a gala ball. He challenges Sammy to open the safe in less than three hours. If Sammy can do it, he can keep an envelope containing $50,000 dollars that is being kept within the safe. If he can't, then he gets some consolation prize. Initially Sammy is reluctant. He has given up on safe-cracking and is trying out a new profession. Eventually, he agrees. At the party, Harrison puts the envelope in the safe and locks it. Sammy is given three hours, but he fails to open the safe. He is given the consolation prize. Harrison is pleased since his advertising plan is a success. Later, however, he opens the safe and discovers that the envelope contains worthless paper and no money. Sammy pulled a switch. His new profession is as a pick-pocket.