Identical twins Ruby and Garnet are inseparable. They do everything, and go everywhere, together, even though they are very different: Ruby is much more outgoing and loves sports, while Garnet is quiet and enjoys reading. They love being twins, and since the death of their mother they have lived with Dad and Gran and been closer than ever, safe in their own ten-year-old-world. But then Dad finds a new girlfriend, Rose, and everything in the twins’ lives is turned upside down: new home, new school, new everything. And gradually, being twins isn’t quite the same anymore. Then Ruby spots an ad in the paper: ‘twins needed for TV serial’. It seems like the chance of a lifetime, but there’s one snag: Garnet hates the idea. Can being a double act work for ever?