Oscar winner Helen Mirren and Ed Harris have joined the cast of Disney's action-adventure sequel "National Treasure: The Book of Secrets" which is now filming.
Nicolas Cage reprises his role as the treasure-hunting Ben Gates. Mirren will play Emily Appleton, Gates' mother. Harris plays the villain.
In the sequel, one of Cage's ancestors is implicated in the assassination of Abraham Lincoln. This thrusts Gaes into a globe-spanning adventure to clear his family name and find a missing treasure along the way - the missing pages from the diary of assassin John Wilkes Booth.
Most key members of the original cast are reprising their roles including Diane Kruger, Justin Bartha, Jon Voight and Harvey Keitel.
The film is being shot in Los Angeles, Washington, D.C., London and Paris. Studio will release the film December 21st.