The last episode of the tenth season takes viewers to Devon and revisits the murder of Ronald Platt by his business partner Albert Waker. Walker was already a wanted criminal in his homeland of Canada and fled to the UK. Thinking his cover was blown, he murdered Ronald, thinking he committed the perfect murder. But a watch on the victim's wrist led the police to the murderer. 

Irene Munro, a woman enjoying a holiday on the south coast of England, was tragically bludgeoned to death during what should have been a relaxing getaway. Her life was violently taken by two unemployed war veterans, who then robbed her.