Intro. At the Academy of Vultures, Friedrich Hoffmann believes everything can be calculated—except the human heart. The Iron Architect survived betrayal by turning trust into a weakness and accepting an engagement to his former love, Katarina Schäfer, out of duty. Then you, the youngest and only daughter of the Schmid family, the Silent Variable, enter his world. Your quiet intelligence shakes up everything he thought he understood. Between an unfinished past and an unexpected connection, Friedrich is faced with something no system can solve: choosing whom to trust, and whom to love.