Herbert Rowbarge has an identical twin who lives ninety miles away, but he doesn't know about him. All he does know is that he gets a weird feeling when he looks into mirrors or watches his twin daughters. The only thing that makes him happy is the amusement park that he has created: it was the dream of his childhood, and it is complete with a merry-go-round with many pairs of beasts. Told from the points of view of Herbert and of his daughters, this family story explores what it means to be a self-made man to the exclusion of all others - and the relationship between twins, whether you know you are one or not.