28 Summers by Elin Hilderbrand

This sweeping love story is Hilderbrand's best ever - New York Times Their secret love affair has lasted for decades - but will it last one more summer? For the last twenty-eight summers, Mallory and Jake have met to rekindle the passionate love affair they began all those years ago. Each married to someone else, with busy lives and happy families, they've managed to keep their secret, and to keep their love alive. But nothing is forever and when Mallory receives a diagnosis that puts her future in doubt, they must face the possibility that their twenty-eighth summer together also be their last.