The Ring of Betrayal - Realm Walker, #4

Still pining over Tania and hesitant to follow fate's path, Terra fights the undeniable attraction she and Hank share. She can't help jealousy's ugly head rearing when Hank is showered with female attention. Life relieves her temporarily of her inner Hank turmoil as she is thrust into the secrets of the past and the destiny of a future only she and Hank can save. The Serenity Tree is dying and the Stones of Hovrath are stolen from under her nose.
Facing the withered tree, she finds they must go to Marsidia to save the tree, the realms, and all life, or everything will perish and succumb to darkness before life can start anew. The weight on her shoulders heavy as bars of gold. If that wasn't enough, a new and powerful enemy stands in her and Hank's way. Will she succumb to her feelings for Hank and defeat the enemy, salvaging all that's been destroyed?