When Sophie falls asleep wearing a locket that belonged to her grandmother's geat-grandmother, she magically travels back to 1858 to learn the truth about the mysterious Charlotte Mackenzie. Charlotte and her sister, Nell, live a wonderful life on a misty Scottish island. Then disaster strikes and it seems the girls will lose everything they love. Why were the sisters sent to live with strangers? Did their uncle steal their inheritance? And what happened to the priceless sapphire - the Star of Serendib?