In this third snack-fueled adventure, the cats high-tail it back to the spirit realm to investigate a magical mystery: The Dragon Witch’s magical artifact collection has gone missing, and the whole forest is covered in mysterious slime! Squash and Ginny follow clues to places old and new, like Mewmaid Ocean, Bum Bum Bog, and eventually to a secret tunnel that leads beneath Unibear City, the hub of the spirit realm.

Deep underground, Squash and Ginny discover a conniving plot by a dangerous new foe. They rush to recover the artifacts, stop the slime, and save the day—and quick! Otherwise, life in the spirit realm may never be the same…