To produce one long thread of silk, a weaver must never allow the silkworm to fully transform or ever emerge from the cocoon into the light. Ruby and Sally Moon are twins, cut from the same cloth but as different as night and day. While Sally is bold and adventurous, Ruby is quiet and creative. When divorce splits their family in two, and Sally moves with their mother to the Northern Territory, Ruby holds on to the thought that one day her family will be complete again. But when tragedy strikes, wrapping Sally in a cocoon from which she might never escape, Ruby learns that love is never simple but one of the many tangled branches in her family tree.