A pharmacist goes undercover to expose a ring of drug-dealing doctors; a flaming automobile with a corpse inside is a clue in a bizarre murder story; and a mother who lost her child when emigrating to the United States searches for her son in hopes of being reunited after forty years.

An eleven-year-old boy provides the police with significant clues in the search for his missing mother; a device for washing bean sprouts is the unlikely bait when police try to bust an Asian drug ring; and eight adult siblings, adopted as children, seek to reunite.

The mystery of a humming sound emanating from the waters of a houseboat marina in Northern California; two Seattle residents poisoned by cyanide-laced capsules spurs an investigation that reveals a murder plot; a man sentenced to 55 years in prison begins a letter-writing campaign to prove his innocence.

Stolen high-tech telephones transmit the whereabouts of the thieves who took them; an eavesdropper listens in on a terrifying murder plot; and a son searches for his estranged mother after 44 years.

A man's search for the hit-and-run driver who killed his sister; a police search for a missing cockatiel and $8,000 worth of stolen household items.

A communicable disease specialist seeks the source of a rare disease contracted by a baby; a piece of cheese with strange teeth marks provides the only clue in a burglary case.