A young man wakes up on the beach of Föhr - barely dressed and with no memory of the evening before. A short time later, mudflat guide Leevke Roeloffs finds a dead, naked woman in the mud between Föhr and Amrum. A gloomy coincidence or is there a connection between the two events? While the Flensburg special investigators Päschke and Siebold are ordered to the island to clarify the case, Leevke and her aunt Marit investigate on their own. But the truth they uncover in front of the idyllic holiday backdrop comes at a price.