Agnes, a teacher from the Hessian provinces, has come to Berlin to identify a dead girl who might be Lydia, her runaway daughter. It turns out not to be Lydia, but Agnes stays in the city anyway. Still frantically looking, she comes a young stray called Ines who no longer leaves her side...

Johannes, a doctor of physics, travels with his doctoral supervisor to a scientific congress in the Alps. A series of mysterious incidents occur on site. He meets Karin, a mysterious jazz pianist who seems to know more about him than she can know. Suddenly, mysterious deaths begin to pile up and Johannes tries to uncover the secret under the mountain.