Ruler of the Tides (Book Four of the Elementals)

Renuo is... maybe... the Water Elemental. He's not sure. What he has done with his affinity hasn't proven to be much. After a vision of a temple at the bottom of a lake, he tries to keep his hope from rising.
The trip to reach the possible temple is as dangerous as the other two, and if Renuo can open it, he's sure the trials will be no different. What none of the Elementals could predict, though, is a shocking betrayal.

Cover by @Jells_ [Majestic Inc]