Shut Your Eyes Tight
This book is [book:Think of a Number|7853137].
It's structurally identical and the plot is so similar as to make the identity of the murderer obvious from very early on, assuming you have already read Verdon's first novel, which I have. So that's a bit disappointing but it's a gripping read anyway - because it becomes a "howdunnit?" not a "whodunnit?"
Yes, the way the crime was committed becomes the central mystery and it's compelling enough to make me forgive the otherwise repetitious nature of this sequel - but Verdon should look to shake things up for the future. Going by the blurb on the back of his third novel, he hasn't, though.
Also seen at: http://www.goodreads.com/review/show/595544186