Oscar winner DAME Helen Mirren is set to play Nicolas Cage's mother in the sequel to action adventure National Treasure. THE QUEEN star will join Ed Harris in the movie, NATIONAL TREASURE: THE BOOK OF SECRETS, while Jon Voight, Diane Kruger and Harvey Keitel will reprise their characters from the first film. The sequel will follow Cage's character BEN GATES as he attempts to uncover the truth behind the assassination of US President Abraham Lincoln.