New York Times best-selling author C. J. Box's Below Zero is the 10th novel featuring Wyoming game warden Joe Pickett. The telephone calls from her stepdaughter April send chills down the spine of Joe's daughter Sherry. Wasn't April murdered six years ago in a bloody massacre? Wondering how this youthful caller knows details only April could know, Sherry becomes confused while Joe grows suspicious. Is the caller April-or are Joe and his family victims of a cruel hoax?