Magic Study by Maria V. Snyder

"Family betrayal, a power-mad serial killer and a potential diplomatic crisis threaten the independent-minded heroine of Snyder's fine sequel to Poison Study (2005). With the overthrow of the royal family of Ixia, 20-year-old Yelena Zaltana, who was kidnapped as a child by the evil magician Mogkan, is now free to return home to Sitia. Her reunion with the family she hasn't seen in 14 years palls when her brother spreads rumors she's actually a spy from Ixia. At the Magician's Citadel, where Yelena enrolls to hone her prodigious magical talents, her powers raise concern that she might be a rare, powerful Soulfinder. Then a string of ugly murders reveals the presence of a rogue magician in the area. As Yelena joins the hunt for the killer, complications grow with the arrival of a diplomatic mission from Ixia—including her lover, Valek, a notorious spy and assassin, sure to be executed if anyone sees through his disguise. Snyder's lively, charming mix of romance and fantasy is sure to gain her new fans."

~from Publisher's Weekly Review