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A confidential report has identified a string of murder-suicides that could in fact be the work of a serial killer who attacks vulnerable elderly couples with extreme violence. Could this killer still be at large? And could a pattern of behaviour truly have been missed for 15 years?

Guests: 

David Collins, Northern correspondent, The Sunday Times. 

Jonathan Calver, Insight Editor, The Sunday Times.

George Arbuthnott, deputy Insight editor, The Sunday Times. 

Additional music by Jordan Powell licenced under Creative Commons

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