Song of the Abyss

A century ago, Endymion, youngest of the seven sons of the Sea King, would have killed a human on sight. But upon finding a trespassing human woman swimming inside his beloved ocean kingdom of Nendavia, Endymion struggles to follow through.

For the safety of his people, he's unable to let her leave, so decides to bring the human, River, back to Nendavia, upending the balance of his kingdom. Hated by the Nendavians but restricted to the ocean kingdom where she can breath, River is an unwilling, strong-willed guest who constantly tests Endymion--and his brothers'--patience.

But something more troublesome than human presence stirs in the heart of Nendavia. When River accidentally learns of a plot to overthrow the royal family, she must convince Endymion of the danger to himself and his throne, while also navigating alien Nendavian politics and her growing attraction to the youngest sea prince.

One thing is clear though.

Don't call them mermen.