It sure does. "Why didn't they ask Evans?" turns out to be a very enjoyable read. The most important and main thing about the book is the Plot. The Plot is so intricate, detailed and layered that you will be left baffled and surprised at many instances in the story. I tried to find flaws and pick mistakes in the story but I just was not able to. The Author thought of everything well in advance and page by page started pouring in the details.
The Collins edition that I have has close to 360 pages but it never gets boring. The mystery is "cunning" and the book is not bereft of twists, even the identity of the murderer is not easy to figure out, but not very well hidden.