This is one of my favourites in the long Poirot series of Agatha Christie. What I particularly like about this story is that it gives you more insight in the way Poirot thinks about a case and gets to the truth than in the others. It also really gives a lot of interesting settings and information to the reader to allow him/her to try and find the guilty one himself/herself.
The characters in this book are well gone into and very likable. The world of London's theatre and film actors and the odd comparison with France (Paris) and the USA make it all the more interesting to read.