It starts when a young girl wakes in the night and sees them – thin men with yellow faces, standing at the foot of her bed. When social worker Gabby is called in to investigate, she begins to suspect that the girl’s wild stories might just be true. Battling unbelieving superiors, mocking police officers, and her own inner demons, Gabby finds herself drawn into the uncharted reaches of a society she always thought she understood. And deep inside the rotten heart of England, the thin men with yellow faces turn their hateful attention towards her…