Christopher's father finds Christopher's book and is mad at Christopher for disobeying what he had told him not to do. They get into a fight and Christopher's father takes away Christopher's book.
Christopher thinks that his father put his book in his room so he sneaks in. He finds a letter that is addressed to him in his father's shirt box. His father comes home so Christopher takes it to his room.
Christopher reads the letter and is confused by it. He decides to investigate further by looking at other letters in his father's room but has to wait for an opportunity to sneak in.
Christopher eventually sneaks back in and reads more letters. He realizes they are written to him by his mother. His father had told him that she had died, but Christopher now registers that his father had lied to him this whole time.
Christopher starts to feel "giddy"(Haddon 112). He feels like the room is swinging from side to side, and his brain isn't working properly. He curls up into a ball on his father's bed and says that his stomach hurts. He blacks out.
Christopher wakes up with vomit surrounding him. He doesn't remember what happened for a while, but knows that time has passed because it is dark out and his father is at home looking for him. Christopher doesn't talk for a while after his sensory overload.