The unsolved double murder of two teenage girls. They vanished on a crisp autumn night more than a 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.