P.C. Cast 
Divine Beginnings (Partholon prequel novella) [EPUB ebook] 

Go back in time, fifty years before the events with this prequel novella in the Partholon series from No.1 New York Times bestselling fantasy author P.C. Cast. Something isn’t right at Guardian Castle, and Aine can’t figure out what. As Healer, she’s supposed to be making things better, but there’s a darkness that can’t be brightened. And then Aine finds an injured Fomorian — winged, dark, blood-thirsty and inherently evil. Or is he? Because there’s something about Tegan that Aine can’t resist…and once they’ve shared blood, Aine realises that everything she’s always believed is going to be cast aside…