Carter and Sadie Kane were split up at a young age when their mother passed away in an accident. Carter went to live with their Egyptologist father and traveled arond the world. Sadie lives in London, England with her maternal grandparents, who blame their daughter's death on Mr. Kane.
On Christmas Eve, the children are together with their father when he inadvertantly blows up the Rosetta Stone and is taken prisoner by an evil Egyptian god. Now, the world is in danger, and Carter and Sadie, siblings who barely know each other, must work together to save their father.