It followed the adventures of Jane and Rupert Chatwin as they sought the remnants of the Great Shark Army to help them take Fillory back from the Watcher Woman. The book sold poorly due to the continued public preference for J.R.R. Tolkien's The Hobbit.
- The book was first published in 1938, and sold poorly due to being overshadowed by the work of J.R.R. Tolkien, whose work was of higher quality.