Leviathan is a young adult fiction novel by Scott Westerfeld, part of The Leviathan Trilogy Series. Published by Simon Pulse in 2010, this trade paperback book features a mix of historical, action & adventure, and science fiction genres. The novel explores themes of royalty, steampunk, and science fiction, with illustrations by Keith Thompson. With 464 pages, this book is a captivating read for young adult readers interested in a futuristic and thrilling world filled with surprises and adventure.