From a playful gesture between an old woman in a swimming pool and a youthful lifeguard springs the heroine of a novel: Agnès. In the course of her daily life - Saturday chores, saunas, lunch in the hectic Paris streets - memories arise of her dead father, an unexpected widower. Their conversations flood back, and Agnès realises that her secret inheritance was his way of granting her freedom. As she mentally revisits her childhood, from formative loves to her intense relationship with her sister, her past casts light on her present: her marriage, daughter, and eventual death. Exploring identity and existence, eroticism and modernity - with cameos from Goethe, Dali, Hemingway, and beyond - Immortality illuminates the nature of selfhood with inimitable wit, grace and intellectual nimbleness.