As Siobhan always cares for Christopher, she wondered whether that discovery made Christopher felt about his mother. Judging the way is structure, Christopher's later response clearly exhibits many of his autistic traits; he talks directly to the point as he doesn't bother to use extra word that may make his answer prettier, and as well, he always told the truth, despite it might hurt. He finally concluded that he couldn't feel sad about his mother because she is dead and quoting his own words: "[...] I would be feeling sad about something that isn't real and doesn't exist. And that would be stupid".

Alexander so he confesses he was afraid she would call the police because he was poking his nose into other people’s business.

Then Christopher asks Mrs. Alexander about Mr. Shears

He says that his father doesnt like Mr Shears, so he thinks that its because maybe he killed his mother

Mrs. Alexander acts shock when Christopher says this but assures Christopher that Mr. Shears didn’t kill Mother.

Then Christopher asks Mrs Alexander if she knows why his father doesnt like Mr. Shears

Mrs Alexander reveals to Christopher that Mr. Shears and his other had an affair, so his father dislikes Mr. Shears because of that 

Christopher makes a promise that he would keep that conversation in secret and would not tell anything about it, also that he should not mention Mr Shears name infront of his father because it is a very complicated topic.

After this, Christophers goes to his house.

All this revelations make Christopher thing that if thats the reason why his dad is angry all te time.

Also that he was just trying to solve a crime (the dogs dead) but he actually found secrets about his family.

The next thins that happen in the book are about Christophers intelligence in school and also that he continue writting his book.

Christofer says that it is very likely that Mrs. Shears killed Wellinthong and his father and Mrs. Shears scold him since for them Mrs. Shears is someone bad and that for Christofer is a sign that he killed Wellinthong.

Finally, at the end Christopher is found at a café where he got encounter with a policeman who help him to get a tiket by telling the policeman that he's going to see his mother to London. Because he is a minor he had have meen acompined by an adult so at the very final of the chapter he try to traspass all the check points so he could be allowed to be alone at the train without being noticed.

Then, Chris wanders around the city trying to get to the Train Station, the method he thought better to get there. He gets lost, but is able to make a mental map of the city and walks in such a way that he gets around every corner, so he eventually makes it to the train station. There, Chris gets overwhelmed by the sheer amount of stimuli present. So, he just shuts down - he gets immersed in his thoughts, and stays in a trance-like state for about 4 hours. Worried, a woman decides to call a policeman, who helps Chris to get around the station and to buy a ticket.

Ticket in hand, Chris rides his train. But when he does, a policeman catches him and tells him that his father is waiting for him at the police station. Christopher refuses to, but the officer is about to forcefully take him out of the train, when it starts moving. Then, the officer tells Chris that they’ll be getting down at the next station. But, Chris pees his pants, so he goes to the bathroom. He then decides he’ll hide there until he arrives to London, and he does so successfully.

First Christopher takes the book to school and shows it to Siobhan and they read it, when they finish he asks Christopher if he has told his dad about his mom's affair with Mr. Shears but since he promised his mom that he would not tell anyone, least of all his dad he tells her that he has not told her.

Siohaban asks questions and among them she asks Christopher if he is sad to which he answers that he is not and asks if he is lying since he never lies. Siobhan tells him that sadness in private is not good since it is not externalized.

Christopher insists that he is not sad and that he would not be okay because of his mother's death. Christopher does math at breakfast.During Chapter 109 of the book, various events are addressed, among them are the following.

First Christopher takes the book to school and shows it to Siobhan and they read it, when they finish he asks Christopher if he has told his dad about his mom's affair with Mr. Shears but since he promised his mom that he would not tell anyone, least of all his dad he tells her that he has not told her.

Siohaban asks questions and among them she asks Christopher if he is sad to which he answers that he is not and asks if he is lying since he never lies. Siobhan tells him that sadness in private is not good since it is not externalized.

Christopher insists that he is not sad and that he would not be okay because of his mother's death. Christopher does math at breakfast.

As his dad finds out he asks for his forgiveness and in desperation tells him that he killed Wellington, Chris continues in shock but listens. His father then cleans the sheets and bathes Chris. 

Christopher is scared of his dad, so he decides to flee, going to his garden while taking Toby, two coats and some snacks with him. There he spends the night, but after noticing he cannot be there forever, Chris considers his options for living: Mrs. Shears, Mrs. Alexander, his Uncle or his mother’s house, deciding the best is the last one in London.

He sets to go, asking Ms. Alexander to look after Toby, she is pretty confused so Chris thinks it will be better to take Toby with him. Afterwards, he returns home and takes some snacks as well as his father’s card.

Chris starts his journey walking down the street going to his school until he finds his dad’s car and gets sick again, but he knows he needs to escape. As he does it, he finds a woman with her baby and asks her for directions for the train station. He follows them and arrives at the station, beginning another journey…

During this chapter Christopher tells about the toy train that he has when was a child, comparing this with the train station in Swindon. Telling that in Swindon was a tunnel, stairs, a cafeteria and more. Say that there are many people and that this It made him sick and he felt very upset. Suddenly there was a police officer who asked him if everything was okay, who helped him get the money and train tickets. He bought the tickets and looked for where the station was that he had to board to take the train to London.

Then he took the train, but the police officer came looking for him again because his father was at the police station looking for him.Then he took the train, but the policeman came looking for him again because his father was at the police station looking for him, but Christopher didn't want to go and told the policeman that his father had killed Wellington.

Is important to mention that in chapters before this one, Christopher after discover the dog Wellington of his neighbor Mrs. Shear´s dead in her garden, murder with a fork. Shocked by the incident and intrigued by the mystery, Christopher decides to investigate the murder, despite his father´s warnings not to get involved. He starts documenting clues and interviewing neighbors, including Mrs. Shears herself, uncovering secrets and tensions with the community.

After the encounter with Mrs. Alexander, Christopher grapples with the new information about his mother´s affair and her death, further complicating his understanding of his family dinamics. The revelation provocate Christopher to delve deeper into his investigation, investigating answers about his mothers dead .

The chapter begins when Christopher believes that something very special is going to happen as he has had many "signs" such as seeing five red cars on the street, then he heads to a store and encounters Ivór, leading to the conversation with Mrs.Alexander, Christopher agarra to think that talking to her doesnt break his promises to his father. They walk in the park, where Christopher learns that Mrs. Alexander knows about his mother affair with Mr. Shears, but She didn't know Christopher's mother had died and responds with sympathy when Christopher asks if Mrs. Shears killed her.

After this chapter Christopher go back to his house and has a difficult talk with his father about his mother affair and death. He decides to continué his investigation bito Wellignton’s murder despide his father’s objections, Christopher’s journey of self-discover because he starts to confront the difficulties and thurts about his past and family

So after he decided to go asking many kinds of people, he found out that Mrs. Alexander knew some data about the conflict that his father had with Mr. Sheares had.

Mrs. Alexander told Christ that his mother had a lot time ago an affair with that man, and when his father knew he argued with Chris mom, making her to feel very uncomfortable and hate him.

After that explanation that Christ wrote on his book, he arrived to his house and put the book on the kitchen; unfortunately, his father found the book and got angry, touching Christ and making him hitting his father again.

That's the reason why in this chapter Christopher's teacher tells him if he is scared to go to his house, because his father will be there and he can hit him again. That can be a fact that causes fear.

In the chapter 67 Christopher had the intention to go and search for more information investigate go see or know something about the murder of Wellington. This because he like a lot the topic of investigation, so Christopher continues searching but his dad advertise him that don't continue investigating as his neighborhoods tell him.

After that he continues investigating with difficulties because of his autism but at the end he discovers the relation between his dad and Mrs. Shears.

After the chapter:

When Chris' father comes out, he begins to read them confirming that his mother is alive and his father has been lying to him, an event that caused him a crisis where he felt very bad and that is when his father arrives and finds out that Chris has read everything and in order to calm him down he puts him in the bath while he tells him the whole truth about Wellington's death and why he lied to him about his mother while he cries. After that the father leaves Chris's room promising him that they will talk about everything the next day, however, consumed by fear Christopher decides to run away from home that same night when his father is asleep.

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His father apologizes and says that he loves him and that he would not like to see him in trouble that would cause him any harm.

Christopher likes Sherlock Holmes.

Monday, Christopher comes home from school, he looked for his diary and considered the possibility that it was in his father's room so he went to look for it, in the closet under a DIY toolbox he found it but he also found some letters that were directed towards Christopher, he decided to take one and leave his book so that his father would not get suspicious.

The letter seemed to be from his mother written 18 months ago after her death and told what his new life was like, so Christopher thought it was from another mother to another Christopher, then he decided to go look for more letters when his father was away. and resolve the dilemma.

Christopher explains that there are many mysteries but that does not mean that they cannot be solved but that an answer has not yet been found.

6 days after reading the letter he returned to his father's room and three others at random (there were 43 in total).

In the book The Curios Incident with the Dog at Night Time, some prior events to the chapter 191 are mentioned, such as Christopher runned away from home to look for his mother, so he travels to London, upon arrival Christopher asks some people for information, to know how to get to the train station and also asks for a map. After this events, in the chosen chapter Christopher finds himself surrounded by a crowd of people, so he decides to distract his mind with mathematical equations, after these events a police officer stops Christopjher and tries to arrest him but Christopher screams, after this Cristopher is taken to the police station since his father is looking for him.

The man knows nothing about Wellington, and after a few questions from Christopher, he suggests that the boy should not be going around the neighborhood asking such questions. Then, Christopher talks to Mrs. Alexander from No. 39, who is out working in her garden. Mrs. Alexander is old, very polite and friendly. She is delighted that the boy stopped by, wants to engage in more conversation than he is up to and invites him to partake of refreshments.