A night train, a dead porter, and one ticket stub that shouldn't exist.
The overnight express from Carrow to the capital carries forty passengers, a fortune in someone's luggage, and a porter who was paid to look away. When he turns up dead before the first stop, the train becomes a locked room on wheels. Everyone aboard has a reason to be there. Not one of them is the reason they gave.
5 roles. You take one; your friends take the rest, and the narrator plays any left over. Anyone can bring a character of their own into a role instead.
A railway detective with a photographic memory for faces and a habit of trusting the wrong ones.
A traveling pianist who knows every porter on the line and owes half of them favors.
A fixer who moves other people's problems from one city to another, for a fee.
A conductor who has never lost a passenger and intends to keep it that way.
An heiress traveling under her own name for the first time in a decade.