Tanner Crime No. 5: Three suicides and too many secrets at the prestigious girls' boarding school by the idyllic lake. Tanner takes a job as a cook. Over the course of nine years, three women have committed suicide at the elite girls' school in the mountains, and something is definitely wrong, as Serge Michel from the Bern murder squad realizes. Since they are currently looking for a substitute cook, he asks his friend Simon Tanner to take the job and investigate. It works out, and indeed, something is off, it's palpable. No one knows exactly when the director will return from a congress in Stockholm. A snail congress, as he was only interested in snails. The real authority in the castle-like house by the lake is, after all, his mother, who is said to be the devil herself, according to a strange girl. And does the substitute cook really want to go fishing? First, he needs to clean up.