A young girl visiting the countryside finds herself caught in a web of mystery involving a predatory beast and a secretive local boy. Jess arrives at her aunt's rural home expecting a quiet stay, but the atmosphere quickly shifts as she senses a persistent, unseen presence. She must navigate the tension between the local reports of slaughtered livestock and the suspicious behavior of a boy named Luc. The narrative follows her investigation into the forest's secrets, building toward a critical deadline that looms over the small community.

Readers and critics often note the effective use of atmosphere to build tension within the rural setting. The narrative is frequently described as a concise and engaging mystery that keeps the reader focused on the central enigma of the forest beast. Discussion often centers on the relationship between Jess and Luc, as their interactions drive the primary conflict forward. Critics have highlighted the book's ability to maintain a sense of unease throughout the story without relying on excessive length.