Blood of Kings is a unique book by Jürgen Torvald, author of the best scientific and medical bestsellers The Age of Forensics and The History of Surgeons. She tells the reader about hemophilia, a rare hereditary disease associated with a violation of the blood clotting process. The narrative is built around the confession of the Spanish Crown Prince Alfons, written in the exact way possible, in accordance with the course of historical and medical events. The book is written in a language accessible to the average reader, so it will be interesting to audiences of any age.