Boston is being terrorized by a series of seemingly random murders of women. Based on the true story, the film follows the investigators path through several leads before introducing the Strangler as a character. It is seen almost exclusively from the point of view of the investigators who have very few clues to build a case upon.

A doctor uncovers a hotbed of corruption when he tries to clear a colleague of a murder charge.

A private eye is hired to follow a mobster's former mistress.

On his motorcycle Stein, a half-blood Indian, tries to stay out of the hands of the police, who are chasing him for accidentally killing a cop. Together with his friend Alan and a beautiful but desperate girl Stein will get involved in a robbery and more death. The police intensify the search, but the three won't give up that easily.

Boxer Joe Pendleton, flying to his next fight, crashes...because a Heavenly Messenger, new on the job, snatched Joe's spirit prematurely from his body. Before the matter can be rectified, Joe's body is cremated; so the celestial Mr. Jordan grants him the use of the body of wealthy Bruce Farnsworth, who's just been murdered by his wife. Joe tries to remake Farnsworth's unworthy life in his own clean-cut image, but then falls in love; and what about that murderous wife?

An ESP expert uses his powers to try to track down a psychic who uses telepathy to commit murder.

Demonstrating that a little knowledge is a dangerous thing, a convicted strangler studies the paranormal and finds a way to render himself invisible. Once he escapes, he sets out to find and eliminate five women who remind him of the mother he murdered. A police lieutenant sets out to safeguard them and bring the invisible killer to justice.

After being given a 24-hour leave from prison, in exchange for which she’ll agree to testify against her mobster boyfriend, Cocoa hits the streets, but quickly discovers that violence lurks around every corner.

After serving a prison term, a flamboyant attorney becomes a private eye with a staff of ex-cons.

The life and tribulations of Big Cherry Hill Fats, a 650-pound conman who swindled his victims out of 25 million dollars and helped bring down a criminal enterprise.