The unsolved double murder of two teenage girls. They vanished on a crisp autumn night more than decade ago. Their mutilated bodies were found the following spring beneath the melting snow of the Colorado Rockies. Now—at the request of their families—this cold case is being reopened. Clinical psychologist Alan Gregory has been asked to compile a psychological profile of the two girls. To probe their deepest secrets. To uncover the darkest truth. Even if it condemns the innocent as well as the guilty…