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 ten-year-old named Jimmy Sherman goes missing, and his grandfather suffers a collapse after discovering the boy's blue jeans near a reservoir. When Jimmy turns up alive near Dayton, Ohio, investigators must determine whether he's actually the same boy.