The morning after the storm tide, while walking with her brother Lucas on the watts, Emma finds an old bottle covered in shells. The bottle contains a letter that mentions gold and jewels hidden on some island. The next day, sensational news is reported on the radio: a sunken ship has been discovered on the Norddeich beach! The siblings realize the events are connected and begin investigating. Suddenly, the guys have competitors: the gangsters Karman and Dylda, who escaped from prison, enter the ship, and a map indicating the place where the treasures are buried falls into their hands. Whether there really is a pirate treasure and who will get to it first, the reader will find out from the fifth book of the Detectives of the North Sea series.

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