Beyond the Surface by Colette Davison

Raen has always longed to see the world beyond the surface, but nothing could compel him to break the most ancient law of the merfolk. Could it?
Raen should have found his mate during his first hunt, instead he almost died. Two years later, he’s struggling with internal fear, and his father’s disapproval.

Until he encounters a land-dweller.A man he feels a deep and instant connection to.
A man who will drown if Raen doesn’t save him.But in order to do so, Raen must break two of the merfolk’s rules:
Don’t interact with land-dwellers.
Don’t go beyond the surface.
If Raen saves the man, he stands to lose everything he’s ever known. But if he lets him drown, he’ll lose something infinitely more precious to his heart and soul.