"Rule: Last Sane Woman" is a captivating debut novel by Hannah Regel that explores the themes of friendship and failure in a poignant way. The protagonist, Nicola Long, a young woman with a degree in Fine Arts, finds herself in a monotonous job in London. Her curiosity leads her to a small, underfunded archive dedicated to women's art. There, she discovers a fascinating correspondence that began in the 1970s and lasted over a decade. The letters, written by a ceramicist to a friend, not only reflect Nicola's own experiences but also ignite an obsessive fascination within her. As she delves deeper into the stories, the boundary between her reality and that of the sender becomes increasingly blurred, leading to a disturbing revelation. The novel is crafted with remarkable skill and a witty narrative style that captivates the reader.