"El clavo" is one of the most famous and mysterious works of the Spanish writer Pedro Antonio de Alarcon. In this book, the author reveals a tangled storyline in which elements of magic, love and tragedy are intertwined. The main character finds a treasure in an ancient castle, but he does not even suspect that this resourceful embedded clavom will bring him not only wealth, but also unknown fears. The author skillfully distinguishes the depths of the human soul through the prism of incredible events and mysterious circumstances. "El clavo" is a book that will leave its mark in the hearts of readers and will remain an integral part of their inner world.