When Asher doesn't return from his hunt for buried treasure, Mason wonders what became of his brother. Then Luna appears, insisting that the pod of dolphins swimming nearby have a message for Mason. Do they know where Asher is? To find out more, Mason and Luna have to first earn the dolphins' trust. But when danger strikes, Mason wonders-- is it too late to save his brother, and can he and Luna save the dolphins, too?
Aquatic adventures in the Overworld ; book three.
Marks, Maggie. Aquatic adventures in the Overworld
Marks, Maggie. Aquatic adventures in the Overworld ; bk. 3.
Brothers -- Juvenile fiction.
Dolphins -- Juvenile fiction.
Minecraft (Game) -- Juvenile fiction.
Missing persons -- Juvenile fiction.
Video games -- Juvenile fiction.