William P. Kelley

When the leader of a vicious motorcycle gang finds a farmworker's son flirting with his woman, he beats the boy senseless, then kidnaps the farmworker's daughter.

Reclusive Dr. Zorba has died and left his mansion to his nephew Cyrus and his family. They will need to search the house to find the doctor's fortune, but along with the property they have also inherited the occultist's collection of 13 ghosts.