When the body of Wall Street broker Norman Temple is found dead in his office, the police arrest contractor James Borden for the crime on the testimony of Temple's secretary that Borden had threatened her employer over an unpaid note. Also under suspicion is Temple's Japanese valet, who quarreled with his employer the day before the murder. Tex, a detective, enters the case, following his own leads which prove the valet innocent. Tex finally deduces that Minkin, one of Temple's clerks, shot his employer when he interrupted the clerk robbing his safe. With Tex's revelation, Minkin's room is searched, the stolen bonds found and Borden is freed.

When Jessica Dale, a companion to wealthy Hortense Bates, is found dead and her valuable earrings missing at a masked ball being held at the Bates's home, the only clue is that of a crushed cigarette found beside her. Because the brand of cigarette matches that found in a similar crime being pursued by Tex, the famous criminologist is called in to investigate.