When Dr. Pham becomes the prime suspect in a police sergeant's murder, he must evade capture while police hunt him through caves and neighborhoods, with his life hanging in the balance as evidence mounts against him.

When a young boy goes missing from his backyard, police discover blood evidence and launch a desperate search that leads them to a cave in Southern California where they confront a serial killer who has already claimed one victim.

A secretary orchestrates a robbery of her married lover's jewelry business by manipulating her criminal ex-boyfriend, but her plan to eliminate both men and keep the jewels for herself backfires when police intervention leads to unexpected murder and no stolen goods.

The manager of the Pink Rat Cafe, Mr. Kelby, is killed by the Evans brothers in a robbery. Ben Alexander then assumes the role of Frank Smith as a regular character throughout the remainder of the series.