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Peta and Chris are in paradise. They sail into hell.

Two bodies are found hogtied in the sea off Guatemala - and there’s only one suspect.

Four decades on, Vince Boston recounts seeing his father drown Chris and Peta.

Vince speaks about his mother’s disappearance and Stephen and Dan head to Crimecon.

Boston is finally arrested after 38 years - but crucial evidence remains buried.

Did Boston's mother lie to the boys about Mary Lou?

A bombshell revelation explains why the case went cold for so long

Dan and Vince decipher vital clues in the Mary Sellers notes

Dan, Vince and Penny meet in Belize – and a verdict is reached on Boston.

Vince revisits the murder scene. Penny and Dan search the cemetery in Guatemala.

The FBI faces questions over its failure to find Chris and Peta's graves.

Paradise concludes, asking was Boston a master criminal - or just a lucky one?