Retired early, Helge Stuhr from Kiel only wanted to relax for a week in St. Peter-Ording at the North Sea. However, during his very first visit to the beach, he becomes embroiled in the investigation of a mysterious murder case. A horribly mutilated body has been found beneath a stilt house. And this is right in the middle of the peak season! Panic among the holiday guests seems inevitable, if it weren't for Stuhr, who is available to Commissioner Hansen as an undercover investigator. A hot lead takes him to the offshore island of Helgoland.