Waking the Witch (Women of the Otherworld, Book 11) by Kellye Armstrong

Armstrong's 11th Otherworld urban fantasy, her first book for Penguin since 2003's Stolen, sends two paranormal investigators to the small town of Columbus, Wash. Savannah Levine, a 21-year-old witch from Portland, Ore., who's itching to pursue her first solo case, teams up with half-demon PI Jesse Aanes to look into three slayings with supernatural overtones. Savannah, who displays an appealing mix of toughness and vulnerability, figures she can blast her way to the truth, but matters get complicated fast when her powers keep deserting her at key moments and more bodies pile up. Armstrong skillfully juggles her twisty plot, weaving in characters from previous novels as she builds to a fast-paced conclusion.