The curious incident with the dog that night
The 15-year-old Christopher Boone goes to a school for students with special needs because he has Asperger syndrome. Christopher is a mathematical savant, has a photographic memory, is extremely observant and has a pathological inability to tell lies, though he sometimes gives incomplete information to mislead, an action he identifies as a white lie. However, he has difficulty understanding human behaviour, gestures and relationships. He owns a pet rat named Toby.
http://en.wikipedia.org/wiki/The_Curiou ... Night-time