Summer on Nantucket has given Wyatt, Nick, Ariel and Sheila a chance to work and play. The four are as different as can be, they developed a great friendship that reunites them 20 years later. Thayer takes us on a journey from THAT SUMMER to THIS SUMMER, we see how the four lives have become. We meet their children. We discover some big surprises. And we watch their 20 year friendship turn into new and different friendship.