Desc: Heidis Alptraum: Directed by Anita Hugi. With Marthe Keller. Everyone knows Heidi. But who knows Johanna Spyri, her inventor? The documentary film "Heidis nightmare" (Heidis Alptraum (German title) / Le cauchemar de Heidi (French title) looks behind the Heidi cliche and undertakes a search for traces in the life and work of the Zurich writer. A journey with, amongst others, Japanese animator Yoichi Kotabe (character designer and animation director of "Heidi, girl of the Alps", 1974), filmmaker and screenwriter Petra Volpe (Heidi, 2015) and the voice of actress Marthe Keller. Heidis Nightmare is the very first documentary about the life and work of Swiss female writer Johanna Spyri, whose world famous story has been adapted by international cinema for more than 20 times, for the first time in 1920 and in 1937 by Hollywood.