In January and February of this year, parents searching for their missing children secretly visited a ranch outside the small town of Teuchitlán, in the western Mexican state of Jalisco. They suspected that it had been a cartel training camp and might hold clues about the fates of their children, whom many believed to have been kidnapped or forcibly recruited by the cartels. But once they arrived, they discovered something far worse: what appeared to be three crematoriums littered with bone