In the summer of 1937, Walter Gropius rented a house on Planting Island, near the base of Cape Cod. There, he and his wife, Ise, hosted a festive reunion of Bauhaus masters and students who had recently emigrated from Europe: Marcel Breuer, Herbert Bayer, Laszlo Moholy-Nagy, Xanti Schawinsky and others. Several members returned to travel farther up the peninsula, rent cabins, buy land and design their ideal summer homes. Thus began a chapter in the history of modern architecture that has never been told until now. The flow of talent onto the Outer Cape continued and, within a few years, the area was a hotbed of intellectual currents from New York, Boston, Cambridge and the countrys top schools of architecture and design. Avant-garde homes began to appear in the woods and on the dunes; by the 1970s, there were about 100 modern houses of interest here. In this story, we meet, among others, the Boston Brahmins Jack Phillips and Nathaniel Saltonstall; the self-taught architect, carpenter and painter Jack Hall; the Finn Olav Hammarstrom, who had worked for Alvar Aalto; and the prolific Charlie Zehnder, who brought the lessons of both Frank Lloyd Wright and Brutalism to the Cape. Initially, these designers had no clients; they built for themselves and their families, or for friends sympathetic to their ideals. Their homes were laboratories, places to work through ideas without spending much money. The result of this ferment is a body of work unlike any other, a regional modernism fusing the building traditions of Cape Cod fishing towns with Bauhaus concepts and postwar experimentation.