Jessica, a young coast guard and diver, discovers the bodies of two deceased scuba divers following a storm. She disagrees with her superiors’ conclusion that it was an accident and enlists the help of her childhood friend, Patrik. Patrik and Erica, who are en route to a romantic getaway, decide to make a stop in the picturesque village of Kungshamn. They quickly become entangled in the unfolding mystery. Erica conceals her true identity as the wife of a police officer and is invited to join the local museum association. During her first meeting with the group, the association’s chairman is found murdered. With three deaths now under official investigation, it becomes apparent that the victims shared a common interest in the remains of a ship from the 1820s. Has someone finally uncovered its location? What was the ship’s cargo, and what led to its sinking?