A scene in the book where Christopher experiences a sensory overload
After Father left for his emergency at work, Christopher decided to go investigate the mysterious letters he saw from when he was in Father's room the last time while looking for his book.
After reading a couple of the letters, Christopher came to a sickening conclusion. Mother was not dead. Mother was in London. Mother had been writing him letters this whole time. Father lied.
Christopher suddenly felt very sick. He did not want to read the letters anymore. All he wanted to do was lie down. He tried to do maths in his head but eventually there was a gap in his mind for a couple of hours.
Christopher woke up to find sick all over him and the bed. He also heard Father yelling his name. Father arrived in the room, and saw the letters, the sick, and Christopher. He knew what he had done.
Father ran Christopher a bath, cleaned the sheets, and wiped the sick off of Christopher, all in silence. He had to touch Christopher in order to do this, but Christopher did not scream or hit.
After getting out of the bath and changing clothes, Father sat in Christopher's room with him. He began to explain what happened with Mother and him. Christopher was still afraid. He believed he could no longer trust Father because he told a big lie.