Dinah, Willie, and Susan have long outlived the scandal associated with their ten-year-old menage-a-trois. Dinah, an avante-garde composer, treasures her independence. Yet it takes Willie's kindness and Susan's fire to sustain her. Willie is a left-wing sculptor in a right-wing age. And Susan, his wife, is a fabric designer who craves glamour, wealth, and the attentions of the summer people who visit Cape Cod every year. Then one summer, the balance shifts. Passions are tested, honesty forsaken, and the trio must face the changes brought by their beautiful visitors . . .