 Only the possibility of avoiding a Tong War, plus persuasion by reporter Bobbie Logan (Marjorie Reynolds) leads the famous detective James Lee Wong (Boris Karloff) to enter the Wentworth case. A million and a half dollars in bonds was taken from one of Cyrus P. Wentworth s (Melvin Lang) ship before it was mysteriously sunk and, shortly afterward, Wentworth was found murdered. The police, led by Detective Captain Bill Street (Grant Withers), suspect Dick Fleming (William Stelling), fiancee of Wentworth s daughter Cynthia (Catherine Craig). Wong clears Dick but has difficulty in finding the trail of the mysterious killer.