Murder on the Christmas Express

In the early hours of Christmas Eve, the sleeper train to the Highlands is derailed, along with the festive plans of its travellers. But that is only the beginning of their problems. When the body of one of the passengers is discovered in the locked room of her cabin, all the evidence points to murder. With the train stuck in the snow in the middle of nowhere, it's up to former Met detective Roe Parker to find the killer before they strike again.
But as the countdown to Christmas and their rescue begins, Roz discovers that there are many secrets on board this train - and many passengers with motives for murder...