Katharina Volker's first novel explains, in a first-person monologue, Sarah's visit to the doctor who has to operate on her to "set her free" from her vagina.. The protagonist of The Appointment (La Campana / Anagrama, 2021) tells, with an often very black sense of humour, the series of identity problems - national and intimate - that have led her to make the decision to change her sex. Sarah's testimony, dense, shocking and at times lyrical, is in the process of being translated into fifteen languages after the book was well received in the United Kingdom, where the author, born in Germany in 1987, has been living for fifteen years.