Forced to act as bodyguard for Evelyn Jones because he believes his friend Mary Wesley is being held prisoner, Blackie loses track of the Jones girl and gets himself knocked unconscious. Hours later while he's pleading with inspector Farraday to help him find either Evelyn Jones or Mary Wesley, Mary phones that she's alright. Then Blackie and Farraday go to the house where Blackie said he was knocked out and though Blackie claims it was completely furnished the house is now empty and dust filled. Then they find Evelyn Jones...