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After noted violinist Arthur Williams suffers a hand injury which ends his playing career, his hopes are transferred to his son, who prefers swing music to classical.
Mad scientist works on a death ray in his mountain hideaway.
A crusading district attorney tries to stop a local mob boss who has connections in high places.
When two young lovers are savagely beaten and tortured on a back country road in Texarkana, local police are baffled and must find "the Phantom Killer" before he can kill again.