Blind Elodie's eighteenth birthday gift is a death sentence: her village offers her to Medusa, the Gorgon whose gaze turns men to stone. Instead of killing her, Medusa punishes those who insulted her, and claims her as her wife.
Elodie came to the temple on a bargain: find the Serpent Heart, and Poseidon will save her dying brother. But the monster she was sent to rob has a possessiveness that turns, slowly, into love that neither of them can let go.
Then Poseidon reveals the truth: the treasure is bound to Medusa's life, and her brother and her village are the price of failure. To save the woman she was sent to betray, Elodie will have to do the one thing no mortal has ever survived: kill a god.
