Hans' father, Raff Brinker, suffered head trauma when he fell from a dike. It left him chronically ill, with episodes of amnesia and occasional violent outbursts, so he is unable to work. Mrs. Brinker, Hans, and Gretel must all work to support the family and are looked down upon in the community because they are poor. By chance, Hans meets the famous surgeon Dr. Boekman and begs him to treat their father, but the doctor's fees are expensive and he has been very gruff following the death of his wife and disappearance of his son. Eventually, Dr. Boekman is persuaded to examine Mr. Brinker. He diagnoses pressure on the brain, which can be cured by a risky and expensive operation involving trephining (a surgical intervention in which a hole is drilled or scraped into the human skull).