Plot

The vault of the Trinity Trust Company was to be blown that night by the Wykoff gang. Boyd has the tip and instructs Jimmie Coleman, a central office man, what to do. Broger's tailor shop, fronting on an alley, is the point of attack, and Boyd, in disguise, Coleman and detectives steal up to the place after dark. Boyd gains admission along with Coleman by saying he had a message from the boss, Wykoff. Broger is tied and gagged, and the two sleuths find and open a trap door behind the counter, and descend to the basement. They feel their way along a tunnel. Just as they come to a lead-off, there is a terrific explosion and when the upheaval settles, they discover that the bottom of the Trinity Trust building's vault is blown out. Along the main tunnel come Wycoff and two of his gang. Boyd and Coleman dash from the lead-off, but the master criminal makes good his escape. The next day, Coleman asks Boyd how he had gotten a line on this attempt to rob the vault. It seems that Boyd, knowing he was being watched by some gang, resorted to disguise. Noting a spy enter Broger's shop, Boyd, feigning a business errand, learns of the trap behind the counter. On meeting a friend, Sanderson, he is told a strange story. An acquaintance, Kramer, had asked Sanderson to put a tin box, containing negotiable bonds, in the vault over Sunday. In the box was a costly clock from Kramer's fiancée, and this decided Sanderson to put the box in the vault. Boyd went to Kramer's office in the Trinity building, and entered with a skeleton key. The office had been left for good, and in the rubbish Boyd came upon an old clock case from which the works had been taken. His guess about an infernal machine was correct. Coleman now understood how Boyd got "wise" to rob the vault.—Moving Picture World synopsis