A young doctor is suspected when a series of Jack the Ripper copycat killings is committed. However, when the doctor himself is murdered, his identical twin brother claims to have seen visions of the true killer.
A district attorney is kidnapped by a criminal who then has a deranged doctor do something to him that leaves him with the mind of a child. His assistant seeks out a man who is only known by the car he drives, a Stingray. He helps people who have problems and in return, they owe him a favor that he will collect later.
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