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An elusive gang of thieves have robbed four bars, tunnelling into the premises from adjoining buildings. Collaring a likely suspect, Friday (Jack Webb) plays on the man's inflated ego and discovers that the gang's next target is a bank--and this time, they intend to build their tunnel from below the vault. A suspiciously loose manhole cover leads Friday and Smith (Ben Alexander) to a thrilling denoument in a cavernous storm drain. This episode was inspired by the Dragnet radio broadcast of August 24, 1954.