Bloodring (Rogue Mage Series #1)

In a near-future world, seraphs and demons fight a never-ending battle. But a new species of mage has arisen. Thorn St. Croix is no ordinary neo-mage. Nearly driven insane by her powers, she has escaped the confines of the Enclaves and now lives among humans. When her ex-husband is kidnapped, Thorn must risk revealing her true identity to save him.