Lost Hearts (4 Book Series)

From Book 1: New York Times author Christina Dodd's bestselling romantic suspense series, Lost Hearts…
Mystery and misery scar their young lives. Three sisters and their foster brother are torn apart by tragedy and scattered across the country to grow up alone…
Hope Prescott lives in Boston, far from the warm, southern home she recalls. She works hard with one goal in mind—finding her long-lost siblings. Yet her job at the answering service and her own loving nature creates a family of friends, people she knows only by their voices. She especially likes Griswald, gruff old butler for wealthy Zack Givens.
Meeting Griswald is a shock; he is neither gruff nor old, but a powerful, handsome man. In fact, he is Zack Givens, cold, heartless—and charmed by the artless young woman who brings him chicken soup, treats him like a friend…and falls in love with the humble man she imagines him to be. When she discovers Zack’s secret and faces his betrayal, she leaves without a backward glance. Can Zack solve the mystery that haunts Hope's past to prove their futures lie together?