Son of the Shadows — Nancy Holder

THE MOST POWERFUL FORCE OF ALL...

Jean-Marc de Devereaux, son of the magical House of the Shadows and its most powerful mage, loses a part of himself when a demon ravages his soul. Though an intense union with Isabelle De Bouvard--a powerful mage--enables Jean-Marc to recover his soul, the union costs his forbidden lover her powers. And the powers of darkness still call out to him. If Jean-Marc heeds that call and kills Isabelle, the world will fall to the evil unleashed by their worst enemy--Isabelle's twin sister.

Somehow Jean-Marc must learn to control his deadly impulses and restore Isabelle's memories. And the only way to do that might be impossible. For he must open himself to that most treacherous of all human emotions--love....