His arrival at his mother’s doorstep signals the end of the novel, and shows more closely the trials that parents of autistic children must go through. His father finds out where he has shown up and the resulting clash between the two parents and Mr. Shears clearly not wanting to have to deal with Christopher results in Mr. Shears leaving Christopher’s mom. The dream Christopher explains after he rejects his father is especially chilling after the emotionally powerful scene that came before it. Christopher’s perfect world is one in which the only people left alive are people like him, people who will never talk to him, touch him, or ask him questions.
His stay at his mothers is not as happy as he’d hoped. As a result of his trip it seems he will be unable to take his Math A-levels, which he’d wanted to do, and as a result of his mother’s split with Mr. Shears, they will have to go back to living in his home in Swindon, with his father. The book ends on somewhat of a high note. Christopher’s teachers allow him to take his A-Levels, and his father begins working to repair his relationship with his son, even buying him a dog. Christopher leaves us with a message of confidence. He will become a scientist. He knows he will he “went to London on my own, and because I solved the mystery of Who Killed Wellington? and I found my mother and I was brave and I wrote a book and that means I can do anything.”
The family isn't reunited, but this adds a sense of realism to the story. This is a novel that does not get caught up in sentimentalism, and doesn't fall into the trap of making everything right again in the end. Stuart Murray's article below on autism and contemporary sentimental fiction celebrates this fact.
http://muse.jhu.edu.proxy2.cl.msu.edu/journals/literature_and_medicine/v025/25.1murray.html
Too often do stories with disabled characters at their heart end with melodrama. The real world is rarely so saccharine, and a bit of reality when dealing with disability shows a respect that these fairytale endings cannot.