Arson at Amston Lake

Fire destroys a supposedly empty seasonal cottage, but when a candle is identified as the cause of the fire and a strange symbol has been scrawled on a wall, Dirk Adler wants to know what the symbol means. When a second fire is set and a body is found inside, Dirk decides to find out what is going on. His investigations and his attempts to end the arsons at Amston Lake almost cost him his life.