After a rough crossing from Dover, Colonel Basil Annesley finds he is the only passenger on the Engardine Express from Calais to Lucerne. That is, he is the only passenger until a mysterious woman shows up at the last minute to book a compartment for her servant, an infant and herself. A conversation overheard through the open window of his sleeping compartment only deepens the mystery. The woman is afraid that someone might be following her. Who is after her? What is her secret? And is she a criminal or a victim? Find the answers to these questions and others on a thrilling railway journey spanning Europe.