The Changeling Sea

Since the day her father's fishing boat returned without him, Peri and her mother have mourned his loss. Her mother sinks into a deep depression and spends her days gazing out at the sea. Unable to control her anger and sadness any longer, Peri uses the small magic she knows to hex the sea. And suddenly into her drab life come the King's sons-changelings with strange ties to the underwater kingdom-a young magician, and, finally, love.
A floor scrubber and a magician try to help a prince return to his home beneath the sea and help his half brother, a human trapped in the body of a sea monster, return to the land.