On the longest day of the year, the tiny island of Sandhamn is overrun by people who want to party. They turn up on the ferry and dock their boats in the harbour and drink until they can’t drink anymore. As the police patrol the area, their job is to contain the crowds and make sure the fun people are having doesn’t turn sinister.
Unfortunately, this time, they aren’t that successful and, in the early hours of the morning, the body of a teenager is discovered hidden on an isolated beach. He’s been badly beaten. More unfortunate still for the police, the island is full of potential suspects, not just the teenagers girlfriend and his best friend, both of whom were missing during the hours the murder took place and too drunk to remember what happened.
There were so many people on the island and, as they start to drift away, the police are in a race against time to get statements and try and figure out just who ended the young boys life. Leading the case is one of the central characters, Thomas, a dogged and instinctive detective who is normally helped by his best friend Nora, though never in an official capacity. Nora, though has problems of her own as her boyfriend’s daughter didn’t come home that night and no one knows where she is.