Roy and Joan Clarke were found dead in their home in Melksham, Wiltshire, in December 2004. They’d been stabbed in a ‘ritualistic-style’ attack.

Det Ch Supt Paul Howlett’s suspicions fall on one man. But does his prime suspect have the opportunity to kill the loving parents?

And a deep-dive of the suspect’s computer reveals a sinister fantasy to kill.

Twenty years on, and Roy Clarke’s daughter is still seeking answers.

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