City of Hel. On the one hand, a seaside resort and an industrial fishing town, on the other - a place of strategic military importance. The surrounding forests and waters are full of mysterious places of pilgrimage for treasure hunters and the source of countless conspiracy theories. It is May, before the season, time goes by lazily for the residents and the few holidaymakers - managers at the training, children at the green school, lovers looking for shelter. By the time. Helsinki fishermen catch a porpoise - a small Baltic dolphin suffering from a violent and unknown disease, the source of which may be a virus or ... a biological weapon sunk in the bay. Fearing contamination, the navy stationed in Hel cuts the spit from the world to protect Europe from unknown dangers. Everyone - both residents and visitors - becomes prisoners of the city. It quickly turns out that in this unique place nothing is what it seems. Few people found themselves on the spit completely by accident, and nobody tells the truth .