The sky is full of dungeons, and someone has to clean them out.

Captain Nim runs the most successful adventuring guild in the floating city of Aethermoor, and she's only sixteen. Her secret? The Reverie - a ghost ship that can sail through clouds and over the sea. When your headquarters can appear anywhere, every dungeon becomes accessible.

But this isn't about life-or-death questing. The Windward Guild specializes in the everyday magic that keeps a sky-bound world running: rescuing cats from gravity-defying towers, clearing monster infestations from people's basements, and retrieving grandma's favorite teapot from the ruins that sprouted in her garden overnight. They cook every monster they defeat, turn every expedition into a flying feast, and treat the ancient mysteries of the world like the most wonderful game ever invented.

Until the day the sky-castles start falling.

For the first time in centuries, the legendary floating dungeons are descending toward the surface, and Nim discovers why: her ship isn't what it seems. The Reverie is the keyship to the Tir na Mira - the greatest sky-vessel ever built, sleeping somewhere unknown. The falling kingdoms are being drawn back down to earth, and the mythical Wandering Palace can only be reached when the mother ship awakens.

Now Nim must unlock her ship's true nature and sail vessels the size of cities into spaces that shouldn't exist.

Some adventures are about saving the world. Others are about discovering it was bigger than you ever imagined.