This is Christopher and he has aspergers syndrome, likes maths and his pet rat Toby. His mum died two years ago. he lives with his dad and only likes certain foods.
Christopher finds his next door neighbours dog dead in their front garden with a pitchfork stuck out of his chest. Christopher wants to investigate who killed the dog.
Christopher gets taken to the police station as he hits the police officer because he doesn't like people touching him. He still carries on the investigation even after fathers many attempts at stopping him.
Christopher's father asks him not to speak about Mr Shears around him so he asks his fathers old friend about what had happened. Apparently Mr Shears and mother were close friends and they had an affair.
Christopher's father takes his investigator journal away from him so he goes looking for it in father's room. He comes across some letters addressed to him. he reads them and becomes aware that his mother is infact not dead, but living with Mr Shears instead.
Christopher's father finds him lying on the bed and with the letters. he is very shocked and tries to apologise for Christopher but he doesn't respond.