On Borkum, the party preparations are in full swing, because Caro Falk wants to really let it rip for her fortieth birthday. But when she visits the party location on the beach, a scream breaks through the holiday idyll. A corpse lies on the seal bench - naked and obviously murdered. The dead man is Uwe Petersen, former milk stall king and notorious throughout the island. Although the first guests are already arriving and Caro is up to her neck in party stress, the case won't let her go. Together with Jan Akkermann, her partner in criminal matters, she takes up the trail - because one thing is clear: Before the champagne corks pop, they have to find a cold-blooded murderer ...