Nantucket PennyA dark past can be dangerous, but it can't be as deadly as revengeright? It's wedding season on Nantucket, and two unwelcome guests are crashing the party When people begin disappearing from the island, Nantucket Police Chief Henry Kennis is baffled. The victims are not randomthey're all Nantucket High School alumni. The only clues left behind are pennies dropped at the sites of the kidnappings. There's an old island tradition of tossing a penny from