On behalf of Senator Baldwin (Henry O'Neill) the owner of the world's largest Chinese jade collection, detective Steve McBride (Barton MacLane) investigate a death threat involving the priceless jade tablets that were brought to the United States by three adventurers, who are now on the hit list of an oriental gang. A note written in Chinese warns the impending doom at midnight unless a ransom is paid for the valuable jades, which have been stolen. Steve is put on the case to protect the people who were involved in smuggling the jades into the country.