I've read quite a few books of this genre by Agatha Christie, John Dickson Carr, and others, and I'm usually fairly good (well, let's say that once in a while I'm successful) at figuring out who the murderer is, but here I was completely stumped. This is a very cleverly written story that keeps you interested all the way. The author has taken great care to describe the criminal investigative details and the minutiae behind genetic scientific research and the writing is never over the head of the reader. Detailed description of the interior of buildings and rooms and weather conditions is also excellent. But aside from the ending as my favorite part I was also highly impressed with Widdowson's writing when it comes to the murder itself. Concisely written, this very vivid scene leaves you quite stunned. All in all I thoroughly enjoyed this book!