Snakehead — Ann Halam

PERSEUS, THE GOD-TOUCHED son of Zeus and a mortal princess, takes his easy life on the island of Serifos for granted, but he knows he lives in troubled times. First the gods, now the politicians, send trouble rumbling across land and sea.
When a beautiful stranger, a fugitive from another disaster zone, arrives on the island, Perseus is smitten. But Andromeda isn't all she seems. She must die to save her people, and a stunning, world-changing discovery will die with her, unless Perseus abandons everything to confront the Medusa quest.