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Joe (Jack Webb) and Frank (Ben Alexander) are assigned to probe the mysterious kidnapping of three infants in as many weeks, all of whom have been returned unharmed. Despite setting an elaborate trap involving undercover policewomen and "decoy" baby dolls, a fourth child vanishes. After dismissing one nervous suspect who insists upon turning herself in to prove that she isn't a kidnapper, the two detectives finally resolve the situation by investigating the home of another woman who has no children--but plenty of baby clothes. This episode is based on the Dragnet radio presentation of May 29, 1952.