CAN YOU ALWAYS TRUST THE PEOPLE YOU KNOW THE BestáFrom the outside, the close-knit circle of friends who call themselves 'the Castaways' share an idyllic lifestyle on Nantucket, blessed with money, children, beauty and love.But when Tess and Greg are killed in a tragic boating accident it sends devastting shockwaves through the rest of the group.As the friends grieve, the truth behind their relationships gradually begins to emerge. And for the first time they are forced to ask the hardest of questions.Are their friendship strong enough to survive?Can you live without the person who made you whole?And how do you mourn for a relationship no one knew existed?