"Hope Cahill spent her entire adult life devoted to the Madrigal cause. And even in death, she continues her responsibilities as a Clue keeper. There is a Madrigal clue hidden inside her tombstone. It should be the safest spot in the world, as no one would deface a grave, right? Not true. The same people who killed Hope and her husband, Arthur, for one of their Clues would have no problem paying her another visit."