Detective Leonore Asker has just settled in as head of the Department of Lost Souls, a unit for odd cases, when her father contacts her after years of silence. A body has been found on his farm and, as the main suspect, he is desperate for Leo's help. But is her father as innocent as he claims or is he trying to reel Leo into his grip once again?

Meanwhile, Martin Hill moves to a secluded estate to write a biography about the business leader Gunnar Irving, intrigued by the fact that the legendary property contains an abandoned astronomical observatory. Soon, Hill discovers that the area has more stories to offer...about mysterious lights and mutilated bodies. While Asker and Hill try to find answers, the Glass Man rises from the depths of darkness from which no one ever returns. Nobody but him.