I learned about this book from one of my favourite podcasts, Books on the Nightstand: https://itunes.apple.com/ca/podcast/books-on-the-nightstand/id278076085?mt=2&i=347675868
In the podcast, the author tells a great follow up story to the book.
I really loved this book. I had trouble, at first, keeping all the characters straight. I am glad I stuck with it though. There were a number of times I responded out loud with gasps or laughter to things happened in the story. This is a great mystery. It is based on a real life account, still unsolved, of someone who went missing in the 1930's.