This Unlocked Book 8.5, titled Keeper of the Lost Cities, is a hardcover book published by Simon & Schuster Children's Publishing in 2020. The book is part of the Keeper of the Lost Cities Ser. and has 768 pages. The author is Shannon Messenger and the illustrator is Yes. The book is in English and has a length of 8.2 inches, a height of 2.2 inches, and a width of 5.5 inches. It weighs 30 ounces and is in the genre of Juvenile Fiction. The book's topic covers Fantasy & Magic, Action & Adventure / General, and Social Themes / Friendship. This book is perfect for any book lover who is looking for an exciting and captivating read.