Shadow Rising Dark Dynasties Series, Book 3.

Ancient Secrets, Dark Passions . . . As one of the Grigori, a noble vampire dynasty shrouded in mystery, Ariane has spent her life hidden away in the desert. Like all of her kind, she is a watcher, fated to observe, forbidden to act. Yet when her best friend Sammael vanishes, she defies all rules and flees her safe haven to bring him home. A shape-shifting assassin for the House of Shadows, Damien Tremaine is hired to locate Sammael. His hunt...