"Penny Nichols and the Mystery of the Lost Key" is an exciting detective novel by the famous author Joan Clarke. In this book, the main character, young and resourceful Penny Nichols, finds herself at the heart of a mysterious crime - the disappearance of a key that can solve an ancient mystery. Together with her friends, she begins an investigation that leads them through intrigue, intrigue and danger. Readers will experience with Penny every step of the way to solving the mystery, feeling the tension and emotions that fill the pages of this exciting book. "Penny Nichols and the Mystery of the Lost Key" is a story about courage, friendship and self-confidence that will enchant readers of any age.