In April 1989, investigators discovered a horrifying scene at Rancho Santa Elena near Matamoros, Mexico: a ritual cauldron filled with human remains and the mutilated bodies of fifteen victims. At the center of this nightmare was Adolfo Constanzo, a Cuban-American cult leader whose supernatural “insurance” racket had protected major drug shipments across the U.S.-Mexico border—until the abduction of American student Mark Kilroy brought everything crashing down.