This is a book I saw advertised and lauded on Twitter and since it's published by Harper Collins, I thought, 'How bad could this be?
   Well, it isn't bad, but it isn't great either. Overall, it's quite a good read, but three things spoiled it for me. Some spoilers ahead so jump to last paragraph if you decide you want to give the book a try anyway.
   First, one of the female characters recovers from an attack and immediately realises that a serial killer is on the loose and, not only that, realises what pattern is driving him. The police, of course, hadn't noticed either of these things. It felt totally unrealistic.
   Second, the big reveal of who the serial killer is, is also unrealistic. That person could not possibly have done all he was supposed to and kept at his professional job as well.
   Third, the point above is partially explained by the final rites of the book, when it appears the killer isn't really the killer at all, but someone completely dominated by another person, who really did the killings. The domination seemed unrealistic, and the person chosen by the author to be the actual killer also seemed unrealistic.
   So, in my opinion, this is a flawed novel. Harper and Collins or not, I can't really recommend that you add The Echo Man to your Christmas list.