Sam and Annabel are pleased when they are selected to take a cruise to the Arctic. And they are thrilled when they learn that the cruise will take them past a site connected to the most famous mystery in Arctic history: the Franklin Expedition. But, things on the cruise are not what they seem. When Sam and Annabel make a startling discovery on a small island close to where archaeologists are diving on the wreck of the Erebus, one of the Franklin's ships, they are confronted by an old enemy. Isolated and outnumbered, how can they possibly save the priceless artifact that may hold the answer to the Franklin mystery?