Manchester-by-the-Sea is known today for its historic summer colony, made famous by the rich and illustrious seeking relief from the sweltering city. Its sandy beaches, rocky irregular coastline, and cool breezes provided the perfect habitat for massive summer cottages. Presidents, ambassadors, Brahmans, and robber barons escaped, with a full staff of servants, to an exclusive enclave where they romanticized an idealized past. Prominent artists captured the idyllic environment on canvas, the most famous being Winslow Homers painting of Singing Beach. Originally farmers, the first colonists...