The residents of a quiet English village begin to receive nasty, threatening letters. The wife of the local vicar calls in her friend Miss Marple to investigate.

A scientist comes to believe that evil is a disease of the blood and that the flesh of a skeleton he has brought back from New Guinea contains it in a pure form. Convinced that his wife, a Folies Bergere dancer who went insane, manifested this evil he is terrified that it will be passed on to their daughter. He tries to use the skeleton's blood to immunise her against this eventuality, but his attempt has anything but the desired result.

A mad doctor builds a robot in order to steal a valuable Aztec treasure from a tomb guarded by a centuries old living mummy.

When drillers on an offshore oil rig dredge up several prehistoric eggs, one man is attacked by what appears to be an unidentified deep-sea creature protecting them. Soon, strange symptoms and behaviors become apparent among the crew and one of the creatures grows to adult-size.