Lt. Weigand and the Norths become trapped in the rural home of Dr. Arno, a physician treating a homicidal maniac who's hiding somewhere in the house. The group stages a fake murder scene, hoping the mysterious "Patient X" will be drawn into the open. Instead, when the lights are lowered Dr. Arno's secretary is actually stabbed to death. Once Weigand learns the actual name of the patient, he makes some phone calls and learns they're deal with a real-life Jekyll and Hyde. br br Jerry and Pamela North live in Greenwich Village in New York City. Jerry is a mystery magazine publisher who thinks he is a good amateur detective. He and his wife investigate various crimes and solve them before the police do.br br Directed by Ralph Murphy, Lew Landersbr Starring Richard Denning, Barbara Britton, Francis De Salesbr br Castbr Richard Denning as Jerry North br Barbara Britton as Pamela Northbr Francis De Sales as Lt. Bill Weigandbr Lowell Gilmore as Dr.