I was drawn to the title, and after I began reading I was lured in by the uniqueness of a story told from the point of view of an autistic teenager. Christopher sets out to determine who killed a neighbor's dog, and for the first 40% or so of it, I was with him. I understood his issues, I empathized with him, I too wanted to know the dog murderer. 
 Then it changed for me. I stopped at 60%, and then skimmed until the end. The 'mystery' is dropped, the focus is shifted, and I was more annoyed than entertained by Christopher's continuing logical explanations (and solving of math problems) and/or his emotional outbursts. I didn't warm to the other characters, so it was time to stop. I do appreciate the POV, which felt realistic, though I've nothing to base it on.