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Britain has a long and often unsettling history of unsolved murders.

Some cases have remained mysteries for decades, despite police investigations, witness interviews, and extensive searches. Others have generated theories that have endured for generations, becoming part of the country's true-crime folklore.

What makes these cases particularly compelling is not simply the brutality of the crimes. It is the unanswered question that remains afterwards.

Who was responsible?

Why did they do it?

And...

This July marks the 50th anniversary of the unsolved murder of 15-year-old Enrico Sidoli, a case that remains one of London’s most disturbing cold cases.

On 8 July 1976, Enrico went to Parliament Hill Lido with members of his family. It should have been an ordinary summer afternoon. Instead, he was pulled unconscious from the water and later died in hospital on 19 July.

Police believed Enrico had been involved in an altercation with a group of boys and may have been held underwater. Despite...