The year 2643: Neptune's moon Athos has become the scene of an inexplicable crime. The monastery's life-sustaining AI is suspected of murder. Inquisitor Rüd Kartheiser, a specialist in interrogating artificial intelligences, is assigned to the case. Together with his attractive holographic assistant Zack, who is absolutely devoted to him due to a series of security restrictions, he reaches the small, craggy moon. But the two's investigations meet with resistance. As it becomes increasingly clear that the monks have something to hide, the monastery's AI also turns out to be a cunning tactician who skillfully conceals her actions. When a second death occurs among the monks, Rüd realizes that he is more dependent on Zack's help than ever before. In order to exploit her potential, he makes a momentous decision: he must unlock Zack.
