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Christopher discovers Mrs. Shears's dead dog, Wellington, and decides to investigate the mystery surrounding its death. -
Christopher is questioned by the police about Wellington's death but struggles with social interactions and sensory overload. -
Christopher starts documenting his investigation in a book, which will become the novel itself. -
Christopher's father, Ed Boone, confiscates his book and forbids him from investigating further. -
Christopher uncovers letters addressed to him from his supposedly deceased mother, which his father had hidden. -
Christopher decides to leave his home in Swindon and travel to London to find his mother. -
Christopher faces difficulties navigating the London Underground and experiences sensory overload. -
Christopher is discovered by a police officer in the train station, who contacts his father. -
Christopher's father confesses to killing Wellington and explains that he did it out of anger and frustration. -
Christopher receives a gift from his mother and decides to forgive his parents and continue living with his father. -
Christopher takes his A-level math exam and performs exceptionally well. -
Christopher's mother, Judy, visits him, and they have an emotional reunion. -
Christopher confronts his mother about the letters and questions her about her abandonment.
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Christopher receives a pet rat as a gift, symbolizing his ability to care for another living being.