Man in the Vault is a 1956 film noir about a locksmith, played by William Campbell, who is forced to help gangsters commit a robbery.

Willis Trent wants to rob the safety deposit box of a crooked Los Angeles businessman, Paul De Camp.

He has lawyer Earl Farraday smooth-talk the guy's girlfriend, the two-timing Flo Randall, into revealing the bank box's number.

Tommy is quickly smitten with Earl's girl Betty Turner, but is a law-abiding citizen and rejects an offer of $5,000.

Flo confesses her part in the scheme to De Camp, who goes after Tommy, hurling bowling balls and shooting at him before the cops show up.