How to Defy Logic, Gravity and Uncertainty

Book Two of Tales of a Yumi Master. As to why the Dark Riders have been abducting innocent children, no one knows, but the sorceress Demetra has had enough. She makes a decree that reverberates far and wide, and her call is answered by a task force of Yumi Masters and Warrior Angels. In an effort to resolve the problem, they venture deep into the domain known as the Ocean of Infinite Mystery.