A serial killer. A traumatized criminal psychologist. A dilapidated hotel in whose rooms monstrous things are happening. The first case for Simon Dorn and Lea Wagner - the SPIEGEL bestseller now in paperback Criminal psychologist Simon Dorn ends his police service after numerous personal strokes of fate and retires to the empty Hotel Dornwald in Bad Gastein. There he secretly continues his work. Room by room, he transforms the Dornwald into a showcase of unsolved murder cases. The only connection to the outside world: Karla Hofbauer from Cold Case Management at the Federal Criminal Police Office in Vienna. When Hofbauer is murdered in Hamburg, everything points to a serial offender.