Instruct: Classify the given Amazon review as either positive or negative.
Query: A realistic heroine solves an unusual mystery

Two aspects of this thriller set it apart from the average. First, the heroine is believably fallible. She makes stupid mistakes, trusts the wrong people, and lets her emotions control her thinking. How could I not care about the fate of such a familiar character? Second, the crime she uncovers is an interesting twist on the typical techno-biological plots. As an added bonus, Krist writes clear, effective prose that is a pleasure to read. Kathleen T. Choi, HAWAII CATHOLIC HERALD