When a police detective, a psychic and his pretty daughter, an old caretaker and a noted Austrian doctor spend the night in a dead gangster's mansion searching for his buried fortune, who in this murderous mix is going to die Before Dawn? Gangster Joe Valerie (Frank Reicher) is dying slowly and painfully. He begs Dr. Paul Cornelius (Warner Oland) to end his suffering, telling the doctor that he will reveal the location of his millions in exchange for one lethal injection. The doctor agrees to the deal, but there are others in the house who suspect the location of the ill-gotten riches... others the doctor will have to kill before he can leave with the fortune. Based on a story by Edgar Wallace.