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.
