Timothy Evans was hanged for the murder of his baby daughter Geraldine. The police also believed that he had killed his wife Beryl. But to his final moments Evans protested his innocence. Three years later, a gruesome discovery at Ten Rillington Place revealed that his neighbor, star prosecution witness John Reginald Christie knew much more about the sinister goings on in the house. Set in the dark confines of Christie's home, the powerful drama imagines the relationships between them all.