In the Peruvian Andes, a crystal tablet covered with ancient writing was found during excavations. Already the first attempts to decipher them give reason to assume that the find hides secrets on which the fate of people on the planet depends. But scientists are unable to decipher the text completely - the expedition dies, and the slab with the records mysteriously disappears. A similar tablet is found at excavations in New Mexico, but it also disappears without revealing its secrets to people. Cotten Stone, an American journalist, investigates the disappearance of messages from the past. During the search, she finds out that there were twelve such crystal tablets in total and they are nothing more than instructions given by God to the spiritual leaders of ancient civilizations to help them survive global cataclysms. Meanwhile, a suicide epidemic is sweeping the globe. The Vatican claims that all the victims are possessed by demons at the instigation of the devil, and the world is on the verge of the greatest of disasters... The mystical thriller “The Last Secret” continues the series of books about the adventures of Cotten Stone.