2+. started off strong but as soon as valerie came into the picture it strayed into cliche (i don't know why thriller writers need to talk so much about a cop's instinct/obsession with cases/"the Machine"...it adds nothing to the story). didn't mind the little side tangents - i liked learning about claudia, the sheriff at the end, etc - but when your main cop is so unlikable and frustrating, ugh. also, complete personal preference, i usually prefer when you don't get perspectives from the killer. good case overall, but skipped towards the end just to wrap up.