Book 5 of the Orville Wellington Mouse series Orville's terrifying dream of being cooked in a stewpot by ferocious purple birds marks the beginning of an extraordinary quest to prevent Muridaan Falls from disappearing into the past. In the midst of the worst winter storm in memory, Orville and Sophia must discover the connection between two ancient Mintarian rings, a gold pocket watch that runs backwards, and an extraordinary tree that Orville claims to have seen. Orville, Sophia, and Proto journey to the unsettling Plane of Turris where a startling truth is revealed, redirecting the intrepid Metaphysical Adventurers to the sweltering prehistoric jungle world of Ferus. With help from Science Guild Master Lybis, mysterious Madam Molly, the enigmatic Watcher, ferocious Captain Beaky, amazing Amanda Mouse, the angry ghost of Captain Ryle, and Squeaky the RoboPup, they must stop the Great Thaumatarian Time Wave before Muridaan Falls becomes history.