Anny Brabcová is Sabine Veldenová's maid. She would very much like to get the main role in the new musical "The Pink Letter", in which Veldenová plays. Anna's brother, the easy-going postman Jarda Brabec gets the lyrics to the most famous song of the whole musical "The Pink Letter" from his sister and decides that Anna will sing it at the postal academy right in front of the Minister of Posts, where she will reap great success. Later, when the spoiled star Veldenová ends her role in the musical, the director of the theater Bernhard, with whom Anny is in love, has no choice but to announce an audition for the role.