The monster, which looks like a nastier version of The Creature from the Black Lagoon, invades a sleepy lighthouse town. The superstitious lighthouse keeper is worried for the safety of his beautiful teenage daughter, so he leaves food for the monster, who dwells in a nearby cave. When bodies wash up ashore, the locals take notice.
An unexpected discovery pushes a vengeful, battle-hardened soldier into tracking down a charismatic movie star — the man he suspects of having a secret, whirlwind romance with his wife.
