 A Messenger and guard for a Wall Street brokerage firm are ambushed while making a delivery. During the holdup the guard is killed and Paul Thorpe, the messenger with the briefcase, is taken. He is recognized by one of the three holdup men and that,plus the fact that his uncle is a Cosa Nostra crime boss, saves his life. The men get away with $400,000 worth of negotiable securities. The FBI is soon on the case and begin checking out fences who could handle such a big haul. Thorpe has a fiancée and she is also in danger if he talks.