At the end of the dock in Menemsha Harbor sits a stately white yacht. At 75 feet, it can’t fit anywhere closer in the harbor. Inside the yacht, a woman often sits cross-legged in a bright sitting room, imagining far-off worlds full of romance and historical intrigue. She’s Kitty Pilgrim, CNN correspondent-turned-novelist, and she’s been hard at work writing her third book, while promoting, by boat, her latest release, The Stolen Chalice.