The ghostly guardian

"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 li...