Doctor Who: The Fifth Doctor Adventures: The Merfolk Murders Part 1

St Andrews, Scotland, 1940. The Merfolk are a university society meeting through the summer to discuss murder mystery stories. Innocent escapism during wartime, they say. Their latest book is The Casebook of Orion Hood - whose hero is all-too-familiar to the Doctor...

When a real-life murder occurs soon after their gathering, the Doctor's friends encourage him to investigate. Is one of the Merfolk responsible? Was this crime the result of espionage or envy? The Doctor must embrace his deerstalker once more and solve this wartime mystery - before the killer can strike again!