Chap is a sixteen-year-old boy in an orphanage. He has no relations, grew up with a fake one, and is not leading a pleasant life. Just one chapter into Double and you start to feel really bad for him. Then, out of the blue, two people show up at his door with a poster of a missing boy that looks just like Chap. The missing boy, Cassiel, has a family, which Chap wants so much that he pretends he is him. Valentine tells this story of sadness, mystery, murder, family, and identity theft in a uniquely beautiful way.