When Rosa and Bee get together in the run-up to Bee's wedding, they reminisce about the holiday they took together as teenagers to the beautiful Greek island of Paros. They remember the sandy coves, the guest house in the converted windmill where they stayed with their friend Iona, and the gorgeous local men. As memories of that long-forgotten holiday resurface, they are forced to confront the turns their lives have taken - and the guilt they both feel about letting Iona slip away from them.