In the Sign of the Crystal Ball: The Minotaur’s Labyrinth (vol. 11)

Sahli and Alex are horrified! Argus has succeeded in escaping from the underwater world. But before the friends can take up the chase, Charda dissipates before their very eyes, vanishing into thin air. Of course, Sahli, Alex, and the twins immediately start searching for her. While Argus comes ever closer to his goal of eliminating Sahli once and for all…