Cassandra craves drama and adventure, so the last thing she wants is to spend her summer marooned with her mother and stepfather in a snooty Massachusetts shore town. But when a dreamy stranger shows up on their private beach claiming it's his own and that the year is 1925 she is swept into a mystery a hundred years in the making. As she searches for answers in the present, Cassandra discovers a truth that puts their growing love and Lawrence's life into jeopardy. Desperate to save him, Cassandra must find a way to change history or risk losing Lawrence forever.