Fool's Gold — Vivienne Savage

Theft united two souls, fate may tear them apart. With a war on the horizon, half-djinn Rosalia has limited time to develop her strange new powers and a growing list of adversaries are out for her blood. Every dragon has an obsession in his hoard he'd kill to protect, and Xavier's vice happens to be Rosalia. His failure to guard the world's most dangerous relic brought her into his life. Now he won't let anyone take her away. But if they're to recover the mirror before the armies of Gehenna are unleashed, they'll have to face an unexpected enemy--one Rosalia knows very intimately.