Here is the book description:
With an otherworldly horse borrowed from an astrologer, and armed with a strange magical device, seventeen-year-old Wolfdon Pellegrin sets off through seventeenth-century France and Spain to fulfill his dream of finding the forgotten realm of Aizai.
One obscure book, by the philosopher Paulo de la Costa Santamiguero, has given him a lead to start his journey—go to the northern coast of Spain, where a portal to Aizai supposedly exists.Though death and danger loom ever near, nothing can dim the longing for Aizai kindling within Wolfdon’s heart. Yet even as he strives to discover the mysterious realm’s secrets and fate, a frightening truth becomes clear—one that may cost Wolfdon everything, including the future.
You can get a copy here: https://museituppublishing.com/bookstore/index.php/coming-soon/aizai-the-forgotten-detail
Or check out more on my website: http://thesoulwanderers.blogspot.ca/