Roger Corman directed this tongue-in-cheek story about a gang of crooks who try to swindle a trunk of money away from some Cuban Exiles. Part of their plan involves a fabricated story of a sea monster. Unfortunately the sea monster turns out to be real.

For as long as crime boss Albert Mendoza (Everett Sloane) has been running a notorious ring of hired hit men, District Attorney Martin Ferguson (Humphrey Bogart) has been hunting him down. But Ferguson cuts a deal with Mendoza's henchman Joe Rico (Ted De Corsia), and the mob boss is finally arrested. However, Rico dies mysteriously before he can testify against Mendoza.