Chicago psychiatrist Judd Stevens is suspected of murdering one of his patients when the man turns up stabbed to death in the middle of the city. After repeated attempts to convince the cops of his innocence, Dr. Stevens is forced to go after the real villains himself.

A man finds out that he was brainwashed to kill an important government official.

A newspaper reporter's life is endangered when she is assigned to investigate a political assassination.

When a rich man dies, some items from a collection of his are stolen- an ancient Egyptian gold amulet and the mummy that was wearing it. The police consult scholars from the local University to help with the investigation, which is taking a more serious turn as people connected with the case are killed by wounds that seem to be from a housecat.

The crew of the American destroyer escort, the USS Haynes, detects a German U-Boat—resulting in a prolonged, deadly battle of wits.

Industrialist François Delambre is called late at night by his sister-in-law, Helene Delambre, who tells him that she has just killed her husband, André. Reluctant at first, she eventually explains to the police that André invented a matter transportation apparatus and, while experimenting on himself, a fly entered the chamber during the matter transference.