Mystery of the Sleeping Car Express

'Mystery of the sleeping car express' is Freeman Wills Crofts' earliest short story. At its heart are the expertly researched themes of trains as the author uses his vast knowledge of the world of the railway to establish one of his most complex and gripping cases. There are nine other stories in this collection. In each case the murderer gives the game away to the investigator. Can the reader spot this before Inspector French explains it?