On Christmas Eve, eighty-five-year-old Miriam Caravasios steps onto the ice that surrounds her seaside estate on Maine's Mount Desert Island. As a younger woman, she used to steal out on winter nights to meet her lover, walking across the frozen reach to their secret meeting place. She knows the way--but not the year. Miriam, her mind clouded by dementia, doesn't hear the snap of thin ice until it's too late.Was it an accident? Suicide? Or worse: did someone lure the old woman onto the frozen reach, to her death?There are plenty of suspects; Miriam's fractured and complicated family has gathered in their Bar Harbor mansion to celebrate what everyone believed would likely be the matriarch's last Christmas. The guests include Delphine, Miriam's granddaughter, a frightened and insecure young woman who adored her grandmother, and Miriam's live-in aide, Adam, whom