The curious incident of the dog in the nighttime
Christopher John Francis Boone is a 15-year-old boy living in Swindon, England, with his widowed father, Ed. Christopher's mother, Judy, died from a heart attack two years prior to the events of the story.
One night, Christopher discovers that his neighbour Mrs. Shears's dog, Wellington, has been fatally speared with a garden fork. As Christopher mourns over Wellington's body, Mrs. Shears calls the police. When a policeman grabs Christopher's arm, Christopher panics and hits him, so he is arrested for assaulting a police officer, though he is quickly released with a police caution.
He decides to investigate the dog's death, chronicling any information he receives in a book. During his investigation, he meets the elderly Mrs. Alexander, who informs Christopher that his mother had an affair with Mr. Shears. Christopher will investigate the murder and will find out loads about his life