Adam and Kai land in a new version of the Hollow and search for Mira in a creepy castle, where a gnome's riddle gives them a clue.

In a strange world filled with shifting shapes, the friends face a puzzling villain, then test their luck on a high-stakes game show.

Adam, Mira and Kai deal with a difficult loss, but their search for answers continues. At a scientist's chateau, they tangle with some old rivals.