A young woman discovers that her childhood memories of a mysterious friend are not merely figments of her imagination, but a dangerous reality tied to a supernatural bargain. Polly Whittacker finds herself haunted by fragmented recollections of Thomas Lynn, a man she befriended at a funeral party nine years prior. As she attempts to reconcile these memories with a world that insists he never existed, she realizes that their shared storytelling games were actually a complex magical trap. Polly must navigate the blurred lines between her own creative mind and the encroaching influence of demonic forces to rescue Tom from a grim fate. The narrative employs a non-linear structure, weaving together past and present to reveal the layers of a hidden, magical history.

This work is widely regarded as a sophisticated example of modern fantasy that challenges the boundaries of the genre. Readers often highlight the intellectual rigor required to piece together the non-linear plot, noting that the book rewards careful attention to detail. The prose is frequently praised for its ability to maintain a sense of unease while grounding the fantastical elements in a recognizable, albeit distorted, reality. Critics often point to the author's mastery of subverting traditional hero tropes, creating a narrative that feels both timeless and deeply personal. The consensus suggests that the book remains a significant contribution to the field, appealing to those who prefer complex, character-driven puzzles over straightforward adventure.