| Overview: | Four teenagers decide to spend part of their holiday in an abandoned lighthouse on the fog shrouded Snape Island. One by one they are brutally murdered, leaving only the catatonic Penny (Candace Glendenning) as a mute witness to the slaughter.
The next visitors to the lighthouse are a group of bickering archaeologists, intrigued by the fact that one of the teenagers killed using a solid gold Phoenician spear. While they search the island for similar treasure they are joined by private detective Brent (Bryant Haliday), who looks for proof that Penny did not commit the murders.
When their boat is mysteriously destroyed and their radio is sabotaged, they are left at the mercy of the terrible evil that lurks in the caves beneath the lighthouse, the horror of Snape Island is unleashed
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