River feels responsible for synthetic person Rachel, left alone on a dying world. So she shows her the history of another, and teaches her the responsibilities of time travel.
Rachel has made a choice and joins a new society at the start of its journey. But she has not bargained for the worst instincts of humanity. After leaving her ward behind, can River make it back in time to save her?
River finds herself caged and feeling under the weather. Luckily, her new owners are on hand to take care of her in her 'forever home'. But which of River's keepers can she trust?