The narrator of this straightforward little story about the loss of a friend is a young boy who is remembering what he and Nathan did together. He goes through a series of routine events he and Nathan shared, including teasing Nathan's sister about her pitching arm, nibbling strawberries on the way to school, and practicing their speeches together. The children in class make a "memory box" commemorating Nathan, but his best friend, the narrator, can't participate. His feelings are too complicated. With a little help from an old neighbor, a little time alone in the treehouse and other places he and Nathan frequented, he discovers new possibilities of friendship in Nathan's sister and ways of remembering Nathan that are all his own.