Lia, an innocent mermaid princess, is set up by her jealous sister, Isolde, and hunted down by vicious shark-men. Backed into a corner, she stumbles into a forbidden sea cave—where she meets Abel, the feared Sea God Prince, who is cursed with immortality.
When Abel’s divine powers spiral out of control, Lia is forced to spend one forbidden night with him to calm the curse. By morning, she has lost her innocence—and unknowingly conceived his child.
Terrified, Lia flees and tries to bury the secret, hoping to live a quiet life. But the royal family soon binds her with an arranged marriage decree. To suppress the deadly curse growing inside the Sea God’s unborn child, the merfolk order Lia—already carrying Abel’s child—to marry Abel himself: the ruthless, volatile Sea God Prince with countless lives on his hands.
