The year is 1643. Roberto a young nobleman survives war the Bastille exile and shipwreck as he voyages to a Pacific island straddling the date meridian. There he waits now alone on the mysteriously deserted Daphne separated by treacherous reefs from the island beyond: the island of the day before. If he could reach it time - and his misfortunes - might be reversed. But first he must learn to swim...