"When sea turtles are trapped in an underwater cave, Mason and Luna are determined to get them out. Asher wants to use TNT to blast a tunnel, but Luna insists that mining slowly is safer. Then the guardians show up, claiming the cave as their own. Now the turtles aren’t the only ones in danger! Can Mason find a way to save himself from the deadly sea creatures, too? Find out more in this incredible fourth book of Aquatic Adventures in the Overworld: Potion of the Turtle Master! 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.” -- Goodreads.com