When technology becomes a weapon—and every answer ends in death.
A secret lurks above Tübingen's Schlossberg: a murder, a missing treasure, and an experiment that must never come to light.
Inspector Kleinfeldt finds himself caught between power, betrayal, and technological hubris. The victim was conducting research on a secret military project. A foreign intelligence service is suspected. Kleinfeldt has only seven days to solve the case. The clues lead to a shady boarding house and into the catacombs beneath the Schlossberg. But the deeper he delves, the more dangerous the web of old alliances, deadly intrigues, and AI-powered technology becomes.