Dain's search for a missing priest and a missing sheriff leads him to a successful surgeon who becomes the key to the double mystery.

A friend and private detective disappears while tracking down a missing heir, and Lieutenant Dain searches for him. The trail leads to New Mexico, where Dain discovers his friend has become the prime suspect in a murder after locating one of the heirs.

Frank Dain becomes a homicide suspect in his girlfriend's disappearance and quits the Missing Persons Bureau in order to investigate the case.