The Disciple is set on an island inhabited by a family of four. Vilhelm, the man of the house is in charge of a lighthouse situated here while receiving some assistance from his teenage son Gustaf (Patrik Kumpulainen), who works his days just to be able to prove to his father that he is indeed worthy of succeeding
him. Vilhelm’s wife finds solace in music with the help of a piano while their
daughter, the youngest member of the family, gets by playing with a dog in their
barn. A boat approaches the island. Its only passenger is a young boy who
introduces himself as Karl Berg (Erik Lonngren) . He becomes Vilhelm’s disciple.
At first, Vilhelm dismisses the boy as just another kid. But
the boy proves time and again that he is young, strong, capable and a quick
learner. Vilhelm slowly begins to see that Karl can be put to use and effectively
does so. Karl has been sent from an abusive orphanage. He bears signs of whip
lash on his bare back. Although critical by nature, Vilhelm eventually takes a
liking for Karl. He sees Karl as everything his own son is unable to be. He
decides to adopt the boy, welcoming him not just to his new job, but to his new family. While Gustaf doesn’t fare at his academics nearly as well as Karl, Finnish
film-maker Ulrika Bengts resists the temptation to paint him as an easily
replaceable entity. She shows us that Gustaf is actually more of an outdoor
person. He’s an expert with the sextet, good at swimming and excellent at
navigating the boat. He even lets these skills rub off on Karl. His father
knows nothing of Gustaf’s hidden abilities and continues to find ways to
reinforce his own belief, that his son is indeed useless.