You know the Saybrooks. Everyone does. Perhaps you've read a profile of them in People or have seen their pictures in Vogue. Perhaps while walking along Fifth Avenue, you've been tempted to enter the building with their family name etched into the pediment above the door. The only thing more flawless than a Saybrook's diamond solitaire is the family behind the jewelry empire. Beauties, entrepreneurs, debutantes, and style mavens, they are the epitome of New York City's high society. But being a Saybrook comes at a price?they are heirs not only to a dizzying fortune but also to a decades-old family curse. Tragedy strikes the prominent family yet again when thirty-four-year-old Poppy flings herself from the window of her TriBeCa office. Everyone is shocked that a woman who had it all would end her own life. Then her cousins receive an ominous threat: one heiress down, four to go. Was