The film is about a lesbian German-language teacher, who falls in love with one of her Muslim refugee students.
"Meer bei Nacht" (Sea at Night) tells the story about a man, whose disease took away his self-determination, reputation and social support. His tendency to get lost in memories of his past, leads him to a momentous decision.
In search of her father's murderer, Nina meets the aged ex-cop Rainer. Soon, the young loner and the failed family man fill a gap in each other's lives. But Rainer withholds details about his shared past with Nina's father and Nina must discover if he can be trusted. As Nina digs deeper into Rainer's secrets, she finds him to be a broken and disillusioned man, who resigned from the force due to the corruption within his own ranks. Nina ultimately decides to clean up their past alone and in doing so ventures into mortal danger.