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Walt Disney Pictures and producer Jerry Bruckheimer have begun laying out a map for "National Treasure 2," a sequel to the surprise hit that marked the biggest film of Nicolas Cage's career.

The studio has hired Gregory Poirier to write the movie, which will be directed by returning helmer Jon Turteltaub.

Details of the story are being kept under wraps, and it is unclear whether any cast from the first film will return.

"National Treasure," released in November, revolved around efforts to find a treasure trove with help from a clue hidden on the back of the U.S. Declaration of Independence.

To the surprise of many observers, it overcame lukewarm reviews and became a huge hit, grossing more than $173 million domestically. Since then, Disney had played down the idea of a sequel, saying it would not do one unless a good story could be told.

The first movie had a small army working on it. The film has "story by" credits for Jim Kouf, Charles Segars and Disney feature marketing head Oren Aviv and "screenplay by" credits for Kouf, Cormac Wibberley and Marianne Wibberley.