The adolescent Melli moves from the monastery to a big city. Since she is not very popular and is considered a gray mouse, she wants to be part of the popular girls' clique of the school. In the new environment she falls in love with Roque.
Franziska received 21 letters after her contact ad from a certain Fabian Stiller. The Munich waitress only finds out that his real name was Florian Haugk when her admirer is found dead.