A crook decides to bump off members of his inept crew and blame their deaths on a legendary sea creature. What he doesn't know is that the creature is real.
A disgraced merchant marine officer elects to stay aboard his sinking cargo ship in order to prove the vessel was deliberately scuttled and, as a result, vindicate his good name.
With the help of some seedy gangsters, young attorney Steve Keiver makes some quick cash by bending the law, and in the process, he impresses the mobsters so much that they invite him ...