A young psychiatric nurse goes to work at a lonesome asylum following a murder. There, she experiences varying degrees of torment from the patients.

A nerdy high school super whiz experiments with a chemical which will transform his guinea pig "Mr. Mumps" from a gentle pet into a ravenous monster. In a fit of rage against his tormentors at the high school, Vernon Potts goes on a killing spree, eliminating all of those who ever picked on him - the Gym Coach, the School Jock, The Creepy Janitor & his hated teacher, Ms. Grindstaff.

Three eerie tales based on actual events are enacted in this film. First, three college students play a prank on a geeky classmate, who is accidentally shot and killed. His vengeful mother forecasts the deaths of the three young men she holds responsible, on 7, 14, and 21 days hence. And, one by one, her grim predictions come true. Next, a ghoulish sound emanates from a mist-shrouded hole in the Earth near where a Missouri boy has lost his dog. The boy's father is lowered into the hole and lets out an agonizing scream! Finally, a senator returning home from a party finds a lost girl on a bridge and learns from her father that she died years earlier

A gangster who has commited all kinds of crimes is accused to have killed his wife. As he was not the murderer in this case Perry Mason intents to find the killer...