Problems right from the start
Our murderer kills a man by stabbing him six times in the torso and twice in the throat, yet somehow doesn't get covered in blood. There's even a mention of the arc of blood from the throat wounds. Throughout the book, he kills people at close quarters with a knife and somehow never gets bloody. The only time blood gets on him, it's his own when a dog attacks him. This guy should have been covered in blood from the murders, but somehow avoids it 4 times. There were a few other believability issues scattered through the book, but I found this one to be the most blatant.
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