"Unknown Blood" is an exciting psychological thriller from the famous Spanish writer Robert Vilar. In this book, the author skillfully combines the elements of detective, intrigue and deep drama, creating an unpredictable plot that keeps the reader in suspense until the last page. The protagonist of the book, inspector Raul Casta, finds himself at the center of a complicated case about a series of brutal murders. To solve this case, he must dive into the world of crime and intrigue, uncover secrets that may call into question everything he believed to be the objective truth. "The Ignorance of Blood" is a book that will amaze you with its intense atmosphere, well-built characters and unexpected plot twists. This is a work that will leave a mark on your soul and make you think about the nature of evil and human nature.