When medical student Kathie Durst vanished in 1982, she was married to Robert Durst, son of a New York real estate magnate. Kathie’s friends had reason to implicate her husband. They told police that Kathie lived in terror of Robert, and that she had uncovered incriminating financial evidence about him. But Durst’s secrets went even deeper. For decades, Kathie’s disappearance remained a mystery. Then in 2001, Durst, an heir to an empire valued at two billion dollars, was arrested for shoplifting in Pennsylvania. When the police brought him in, they discovered that he was a suspect in the murder of Texas drifter Morris Black, whose dismembered remains were found floating in Galveston Bay, and that Durst was also wanted for questioning in the killing of his friend, Susan Burman, in Los Angeles. Based on interviews with family, friends, and acquaintances of Durst, law enforcement, and others involved in the case, is a cross-country odyssey of stolen IDs and multiple identities that raises baffling questions about one of the country’s most prominent families—and one of its most elusive killers.