I really enjoyed this, I enjoyed that it was a 'cold case'.  The biggest issue I had was the title and trying to make it fit it didn't work.  There is a lot of Poirot on the page, you get to see both his greatness and the not so great characteristics and his inner thoughts which was interesting.  The descriptive language and characters were the real strength of this book.  The red herrings were obvious, but fun to guess along to.  Overall this was one of the better Christies especially for a lesser well know one.