Hour of the Hunter by J. A. Jance

The hunter is free to kill again -- and hour by hour, he draws closer . . .

The brilliant psychopath Andrew Carlisle spent only six years in prison for the brutal torture–murder of a young girl of the Tohono O'otham tribe. The testimony of Diana Ladd -- a teacher on the reservation -- put Carlisle behind bars, and now she can't ignore the dark, mystical signs that say a predator has returned to prowl the Arizona desert. Because no matter where Diana and her young son hide . . . he will find them.