Suspects and other characters include Captain Street (Grant Withers of Radio Patrol) it is investigating the case; his gal, Myra (Maxine Jennings); the bitter inventor Roemer (John St. Polis); the mysterious Olga Petrov (Evelyn Brent of Daughter of Shanghai); and Dayton's partners, Meisle (William Gould) and Wilk (Hooper Atchley).