A young orphan boy finds himself apprenticed to a sinister mill where the price of learning dark magic is his very soul. Krabat, a fourteen-year-old beggar, is drawn by a recurring dream to a mysterious mill in the Black Forest. Under the tutelage of the Master, he discovers that the mill is a school for black magic, but the cost of this knowledge is a cycle of death and servitude. The narrative follows Krabat as he navigates the rigid, oppressive hierarchy of the mill, attempting to master the dark arts while seeking a way to break the Master's hold on his fellow apprentices. The story is told with a somber, atmospheric tone that emphasizes the psychological and physical entrapment of the boys within the mill's walls.

Readers frequently highlight the chilling atmosphere and the effective pacing that builds tension as Krabat learns the secrets of the mill. Discussion often centers on the moral complexity of the characters and the way the author balances dark fantasy elements with a grounded coming-of-age narrative. Critics often point to the book's ability to maintain a sense of dread without relying on excessive violence, focusing instead on the psychological weight of the protagonist's choices. The work is widely regarded for its strong thematic focus on the struggle for autonomy against an oppressive authority figure.