Thrilling detective novel taking place in the Engadine Express from Calais to Lucerne. It is a well-planned, logical detective story of the better sort, free from cheap sensationalism and improbability, developing surely and steadily by means of exciting situations to an unforeseen and satisfactory ending. A mysterious woman, followed by two detectives, shows up at the last minute to book a compartment for her servant, an infant and herself. The lady is afraid that someone is following her. What is her secret and who is she? And is she a criminal or a victim? Find the answers to these questions and others on a thrilling railway journey spanning Europe.