When a young boy is disturbed by terrifying visions, Nathan finds himself drawn into another case. Charlie's nightmarish hallucinations lead him into increasingly dangerous situations, and Nathan must find a way to help him before his imaginary friends do some serious harm. But Nathan's belief in scientific and rational explanations is rocked by a growing sense of unease, as he starts to experience some mysterious visions of his own. Are all these strange events linked merely by coincidence, or is there something deeply wrong at Shepzoy?
Gwen recognises that Charlotte wants a baby, and tries to find a way to help her. But Charlotte must also steer a safe course for the farm while her husband is preoccupied, and the possibility of a new railway line across their land could offer the chance she's been hoping for.
