When Dr. Koenig, head of Mayfield Sanitarium is murdered, the District Attorney's Special Investigator, "Bonnie" Dundee must go undercover to find the killer. Were any of the inmates of the asylum insane enough to have committed the crime? Or, was it one of the staff, motivated by jealousy? And what was is the secret in the murdered man's past. Find the answer in . . . One Drop of Blood!