The first thrilling case for island commissioner Lena Lorenzen. On Amrum, the small North Frisian island, the head of a children's home is found dead on the beach. The local police assume a natural cause of death until the state criminal police order an autopsy and initiate an investigation. Chief Commissioner Lena Lorenzen is surprised that Criminal Director Warnke has entrusted her with this case. Just a few months earlier, he had removed her from a special commission due to unauthorized investigations and requested her demotion. Lena, who was born and raised on Amrum, is reminded of her past: she left the island fourteen years ago after a dispute with her father. During her days on Amrum, she reunites with her warm-hearted aunt Beke and encounters Erck, her former great love, on the very first day.