Mythical Monsters — Cynthia Sax

Demas must decide between immortality and a siren's love.

Adara, a siren with no powers of enticement, has spent her entire life on an island prison. When she meets a man at the water's edge, she thinks he is her key to freedom. One touch of his hand, however, and she is enslaved once more.

The bargain seemed simple. Demas is to abduct a siren and deliver her to Hades, god of the underworld. His payment for this never-before-achieved task will be immortality. The cost could be an eternity without the woman he loves.