BOOK DESCRIPTION (FROM THE BOOK)  This stunning new novel from Tatiana de Rosnay, author of the acclaimed New York Times bestseller Sarah’s Key, plumbs the depths of complex family relationships and the power of past secret to change everything in the present. It all began with a simple seaside vacation, a brother and sister recapturing their childhood. Antoine Rey thought he had the perfect surprise for his sister Mélanie’s birthday: a weekend by the sea at Noirmoutier Island, where the pair spent many happy childhood summers playing on the beach. It had been too long, Antoine thought, since they’d returned to the island ~ over thirty years since their mother…