Moonfire (2018)

Valdemar and his sister Alexandra are psychopathic siblings living together in a luxurious apartment in Copenhagen. They spend their days indulging in drugs, sex, and violence, luring people into their twisted games for their own entertainment. One day, Valdemar meets Rebekka, a young woman who catches his eye. They start a romantic relationship, and Valdemar seems to open up to her, revealing his softer side. But Rebekka soon finds herself getting caught up in the siblings' dark world, as they introduce her to their twisted games of power and control. As Valdemar struggles with his conflicting feelings for Rebekka and his loyalty to his sister, Alexandra becomes increasingly jealous of their relationship. She starts to act out, becoming more violent and manipulative in her attempts to keep Valdemar under her control. As the siblings' games become more dangerous and Rebekka is drawn deeper into their world, Valdemar must confront the dark truth about their past and make a choice between his loyalty to his sister and his love for Rebekka. In a final showdown, the three are forced to confront their twisted desires and the consequences of their actions.