A lovely story of Alex and Violette, two adventurous young people who decide to explore a mysterious train that comes and goes at night along an abandoned track. There seems to be some unusual cargo and meetings of a group of secretive men. I read this book to hone my french for a visit to France I plan in May. It is easy enough that I could read it out loud and build my vocabulary and my comprehension. I recommend reading French out loud as a means of learning French, or any other language.