The Blue Star of the Nile is stolen from an exhibition guarded by the police under Inspector Farraday. Under intense pressure from the police commissioner to recover the diamond, Farraday tells reporters, among them Dorothy Anderson, that he is sure Boston Blackie is responsible. However, he does not really believe that; it is only a ruse. When Blackie walks into Farraday's office, the inspector is so desperate he deputizes his old nemesis to get the jewel back, using his own methods.