The Silver Switch Key gleamed a deadly message from a plush-lined box ... Thundering in from the East, No. 31 brings sinister news of a murder mystery on the Great Southwestern Railroad. Shining tracks of the Great Southwestern Railroad stretched east to west, and so, too, did Death's bony finger. A railroad executive lies dead. Fighting to hide a ghastly secret, the murderer singles out another victim. A railroad bull suffers the penalty of meddling with the murderer's plans. When it seems the killer might escape, Sherriff Bob Martin, ex-freight conductor, makes himself a human target by pointing an accusing finger. Produced under license from White River Publishing.