Veteran — the hard tier. Assume nothing the file has not proved.
Aurelius Shrike, a shrike, was found dead in berth four of the Down Mail at the dawn halt, struck once from above and behind. The sleeping car was locked at midnight and unlocked at six, and four passengers were inside it. The police have a man already: he is large, he was in the corridor, he owns a dark coat, and every account agrees. That is the whole of what you have been given. Nobody has told you what the train did in between.
You may take 3 of them into the interrogation room. Choosing which is most of the game.
the death of a passenger aboard the overnight sleeper, somewhere between the city and the coast
The dead: Aurelius Shrike.
Grounded in The murder of Florence Nightingale Shore, London to Hastings line, 12 January 1920. Never solved. Read the original. The case is original; the story it learns from is not.