Christopher is frightened by the fact that his father committed a murder. He does not feel safe anymore in the house or anywhere near Father. It is safe to say that Christopher decides to get out of the house by bringing Toby, who is his pet rat, and his swiss army knife. It will be enough to keep him safe, he thinks.
Afterwards, he decided to find his mother in London. This means that he needs transportation to get there, using the train was his safest option. Father is indeed shocked and has no clue where Christopher is, so he reported the case and the police is in search for Christopher. The police is trying to catch him, but Christopher knows so he has to stay in places where the police might not notice.
Not to forget that he is bringing Toby with him, he lost it at one point of his journey. He had to go through tube tracks to find it and ensuring that he gets back on the platform before the train reaches destination.
Eureka, Christopher managed to find Mother’s house. He tells her that he thought she is dead and everything else that happened. His presence is unwelcomed by Mr Shears. It was a heated moment for Mother and Mr Shears. Christopher’s presence also causes Mother to be fired from her job due to absences.
Mother and Christopher went to Swindon together as situations between her and Mr Shears can become toxic. Father tries to apologize to Christopher, but he does not respond to a single word. At this point, Christopher is determined to ensure that he lives with his mom. As what any mom would do, Mother can not say no to his request, which causes an end to Mr Shears’ and Mother’s relationship.
Christopher then continue to sit his A-level in maths and Father tries to recover their bond by buying a puppy that they can look after together. Christopher continue to set goals in the field of math and physics, such as taking A-level further mathematics and wanting to be a scientist. He believes he can achieve these things as he was able to solve a mystery and travel to London all by himself.