Dominic is confused about pictures of himself with other kids he doesn't recognize. He decides to travel to his brother's former university at Cambridge to learn more. On the train, he meets Zita, his mother's former student, who helps him navigate the university. He stays with Zita and realizes his father wants him to be just like his brother. He later learns from his brother's friend and girlfriend about his brother's death. They share he and his brother have the same birthmark. While waiting for the train, Dominic's father spots him so he leaves, and meets one of his brother's famous former professors who takes him to work and shares more about his smart brother, though Dominic senses something strange about