Every letter deepened the mystery. Only one exposed the killer.

In 1964, six-year-old Timo Rinnelt vanished from the courtyard of his family’s apartment building in Munich. What began as a kidnapping investigation spiraled into a maze of anonymous letters, ransom demands, and dead-end searches—until one detail revealed the truth was far closer than anyone imagined. As police closed in, the façade of a kidnapping unraveled, exposing a killer hiding in plain sight… and a crime more twisted than the notes left behind.