Grenier follows three characters in 14th century France:
- Marguerite barely survived a brutal attack from boy-werewolf Jean Grenier. Now, she must stand as a key witness before the King's Magistrate, recounting the violent cannibal tales the boy has told her. When her attacker is not put to death, she must reckon with her intense desire for vengeance.
- Jean, the teenage werewolf, is laid low by hunger and illness. Convicted, but deemed too mentally unwell to face the rope, he is sent away to find his end at a southern monastery, where he's haunted by the demon lord who turned him.
- Eligius, a monk responsible for Jean while he's at the monastery, must face the boy's crimes, and his own desire for isolation, if he wants to survive his brush with evil.
Through all three perspectives, a demonic figure lurks in the shadows, willing the cast to violence and cannibalism.
With a pace that immediately introduces the dark and gruesome cannibal elements without looking away, the work might be compared to The Eyes Are The Best Part (Monika Kim) or Tender Is The Flesh (Agustina Bazterrica) while the atmosphere begs the reader be drawn into visuals a la Nosferatu (Robert Eggers) but set in the Middle Ages.
