Sol skin (2009)

Summer. Nadja, 13 years old, is killing time, eating ice cream and lying on the beach where she becomes fascinated by a model family that she begins to follow and spy on. She meets Eskild, a boy her own age, drifting around on his bike alone, who becomes attracted to her. Nadja makes Eskild an accomplice to her voyeurism, which gradually escalates, when she tells him that the man in the family is her father.