"While mining an ocean monument for gold, Mason battles an elder guardian--and loses. Luna helps him recover from mining fatigue, but he can't recover from a vision he saw. He's sure he saw a ghostly guardian and . . . Uncle Bart! Is his uncle still alive? Mason is determined to find out, until his search takes a dangerous turn. Find out more in this heroic fifth book of The Ghostly Guardian! Brothers Mason and Asher are learning how to cope with life outside the Overworld after a terrifying shipwreck that left them stranded underwater. Teamed up with their new friend Luna, this unlikely trio must make the choice of staying in the world they know best and risk death, or voyaging into an unknown world where anything could happen. In each story of the series for Minecrafters, follow their journey as Mason, Asher, and Luna face incredible obstacles and discover strength they never knew they had in Aquatic Adventures in the Overworld" -- provided by publisher.