When the Plague sweeps across Europe after the Thirty Years' War a boy named Krabat is left without family, food, or hope. An old Mill Keeper takes him in as an apprentice. There are eleven other boys working at the mill, and Krabat develops a friendship with one of them, a young man named Tonda. Soon, Krabat learns that the apprentices are also taught dark sorcery by the master, and one of the rituals lead to an excursion to the nearby village Schwarzkollm where Krabat meets a young girl and falls in love with her. There, Tonda also talks to one of the girls; both seem to be in love with each other. Later, Tonda warns Krabat that the master must never know the name of his girl. One day, while protecting the nearby village from soldiers, Tonda makes an error and his girl's name is revealed to the master. The next day, Worschula turns up in the creek, dead. Krabat mistakenly blames Lyschko, another apprentice. Tonda becomes a recluse and anticipates the end of the year. Krabat's first Silvester brings to light the true horror of the mill. Every Silvester, one of the boys must be sacrificed so the master may remain young. And so at midnight, Krabat's best friend Tonda is viciously murdered, and when Krabat tries to help him he is stopped by the other boys who tell him that "there is nothing we can do". Before he dies, Tonda tells Krabat there is another boy in the mill Krabat can confide in. He also tells Krabat to take two sacks of flour to the village. Krabat is distraught over Tonda's death, but does as he is told. Bringing the sacks of flour to a tree near the village, Krabat once again meets the girl he first met while protecting the village. He is in love, but does not let the girl tell him her name, fearing for her life. Instead, he calls her Kantorka. During the ritual at Easter night, he goes to the village to meet her, this time along with a boy called Juro who appears to be mentally disabled and not able to learn the trade or properly do magic. When Juro tells Krabat that they must leave and go back to the mill, Krabat insists that he will stay with Kantorka. Juro then uses powerful magic to convince Krabat to come back with him, revealing that he is in truth highly intelligent and powerful, even able to change the weather. Juro promises Krabat that he will help him escape the master, and tells him that his girl must ask for him on Silvester to set him free. Krabat tells Kantorka that she must do so, and she agrees and gives Krabat a lock of her hair, telling him to have another boy deliver it to her when the time is right. When Krabat returns, a series of climactic events are set in motion.
