A young girl goes to work as a live-in caretaker for a spooky old woman. She doesn't know that every night, the woman drains some blood from her to feed her strange plant.

A criminal psychologist tries to help a beautiful heiress going mad in a haunted mansion.

A criminal psychiatrist investigates the murder of a two-time widower.

In the 7th film of the "Crime Doctor" series based on the radio program, Dr. Robert Ordway is summoned to take attend a diabetic, and gives an injection of insulin taken from a bottle in the patient's pocket. The man dies and Ordway discovers that what he thought was insulin was really poison. Oops! Two other people are murdered before Ordway discovers who replaced the insulin with poison and what the motive was

A guilt-ridden man blames himself for his wife's death and secretly pays an assassin to kill him. But then he finds out that his wife isn't dead at all. And now the assassin is on his trail, with no way to call off the hit.

A criminal psychologist treats an artist whose blackouts coincide with a series of murders.

The Crime Doctor gets involved in the case of the poisoning of a wealthy industrialist.

Greedy heirs wait in a mansion for a rich cat lover to die, only to learn her cats come first.

A private detective is hired to find a young heiress but finds himself accused of murder.

Dick is faced with a series of brutal murders in which the victims, all from different social and economic backgrounds, are viciously slashed to pieces. Suspects abound but Tracy, getting a clue that there will be 15 murders in all, must find the common thread among the victims before more are killed.

A gang of criminals, which includes a piano player and an imposing former convict known as 'Gruesome', has found out about a scientist's secret formula for a gas that temporarily paralyzes anyone who breathes it. When Gruesome accidentally inhales some of the gas and passes out, the police think he is dead and take him to the morgue, where he later revives and escapes. This puzzling incident attracts the interest of Dick Tracy, and when the criminals later use the gas to rob a bank, Tracy realizes that he must devote his entire attention to stopping them.