On an international flight to a writer's conference, the writer Marta Sanz notices a tiny bump, something she calls a tick, on her chest, just below her clavicle, near her breast bone. It comes with a pain she has never felt before and she is struck with terror. However, this is no instance of mere anxiety or hypochondria. In Spanish, the title is Clav cula, which refers to the collarbone, but also makes a direct pun in that language on the word clav or key. Soon we realize that something has changed for Marta, and that whatever has happened, however hard to explain, is not just 'in her head' but something which is locked up or suddenly hidden away. At the same time, the mystery reflects in everything the author encounters, but especially the bodies of women, and especially women of a certain age. My Clavicle is a masterpiece of auto fiction, the narration of the episodes fracturing like the author's body into a deeply moving series of vignettes that never lose their tension: