Muse: Descended From Myth: Book One (Paperback) by Todd Barselow, Erin McFadden

The Brotherhood of the Guardians has existed for thousands of years to serve a single purpose: the protection of Talents, the mortal descendants of the original nine Muses. Twenty-one year-old Daniel Lyoncourt has trained his entire life to join the Guardians. Daniel is prepared to risk his life in order to keep his Talent safe, but when he's assigned to nineteen year-old Anna Saint-James, he discovers that his life isn't the only thing he could lose. Anna has no idea how special she is and knows nothing about her abilities. He must teach her to control her gifts, keep her safe, and hope that he can find a place in her life as something more than just her bodyguard. All power comes at a price. Like all Talents, Anna must one day make a choice: lose all of her powers, or ascend to a higher plane, leaving behind everyone she loves.