"The Customer", the first long documentary film by German-Colombian director Camilo Berstecher Barrero. An inspiring portrait of the feminist Marlies Krämer, the "Saarland Chixotin", who fights for gender-appropriate language. What has she achieved so far and what does she still want to achieve? Who is Marlies behind the press articles? She was accompanied for more than two years to find out the answer to this question. This publication is a look behind the scenes of this film. The film may be polemical, the topic and Marlies are too. Nevertheless, the film tries to reach the audience and make a contribution: a contribution to understanding the motives of the feminist and campaigner for gender-appropriate language Marlies Krämer.