Victor, a twelve-year-old boy living in Brittany with his grandfather, is determined to find his missing mother. His childhood has been disrupted by grief and school difficulties, but he finds support in his grandfather, friends Fanch and Léonie, and a local legend: the Ankou, a figure from Breton folklore believed to guide the dead to the afterlife. In Le Grand Voyage, Erik L’Homme uses this popular belief as the starting point for a fantasy adventure. According to the tradition in the story, Halloween marks a time when the world of the living comes closer to that of the dead. For Victor, this boundary represents an unexpected chance to find his mother. The boy therefore decides to attempt the impossible. With Fanch and Léonie, he hides in the cart of the Ankou and embarks on an expedition that no one is supposed to return from. The journey takes them far from everyday Breton life, into a universe where legends take shape and where each person must face their own fears. Erik L’Homme, the author of Le Livre des Étoiles, returns here to the elements that have made his place in the literature of the imaginary for young people. The adventure is based on a group of children facing the unknown, but its driving force is deeply personal. Victor does not pursue glory or treasure: he seeks to see someone he loves again. The Celtic legends provide a framework for this quest. The figure of the Ankou, the boundaries between worlds, and the challenges encountered make up a narrative that draws on the marvelous without losing sight of the emotions of its young characters. Grief is accompanied by friendship, fear accompanies courage, and the discovery of the other world leads Victor to confront his own story. In her critical review for Ricochet, Sophie Pilaire notes the place given to Celtic culture and points out the choice of a classical narrative, which allows young readers to use their full comprehension abilities. First published in 2023, Le Grand Voyage joined the Folio Junior collection in October 2025. Already awarded the Ouest-France 2024 and Chronos 2025 literature prizes, it received in 2026 the Lire en Poche youth award, granted by students in CM1, CM2, and sixth grade. A new distinction for this story where the desire to find the dead paradoxically opens the way for an adventure among the living.