Books that Don't Resolve

This is the first of French's popular Dublin Murder Squad, although the series need not be read in order. Tana French writes an amazing psychological thriller, and her story here is tight, twisty, and unpredictable. The story has two primary threads: one revolves around a psychopath, the other around a supernatural disturbance, and you'll be sucked right into both. The murder is seriously grizzly, the book unputdownable—although be warned: the ending is highly controversial.