Shapeshifter by Holly Bennett
Summary: In the land of Tir na nOg, Sive catches the eye of a sorcerer named Far Doirche who wants to use the power of her voice for evil. Her only defense is to escape his clutches by living as a deer, but as the seasons pass and Far Doirche continues to pursue her, Sive crosses over into the mortal world seeking protection from Finn mac Cumhail. She falls in love with him and becomes pregnant, but a cruel trick played by Far Doirche lands her in his grasp at last. Sive makes a deal with Far Doirche to protect her unborn child, but once Oisin is old enough to go and live with his father she...
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