Sony Pictures is opening its "Secret Window" six weeks earlier than originally planned. The thriller, a wide release starring Johnny Depp and based on a novella by Stephen King, is moving from an April 23 release date to March 12. The announcement was made Wednesday by Jeff Blake, vice chairman of Sony Pictures Entertainment and president of worldwide marketing and distribution. "We just had our first screening of the film, and it went great; Johnny Depp is terrific in this film. 'Secret Window' should be finished and ready to go for a March 12 release date, which looks like a very good slot," said Blake, who noted that the media campaign for the film kicks off Feb. 1 with a spot during Super Bowl XXXVIII. "Window" is a story of a writer (Depp) who is in the midst of a painful divorce and is stalked by a psychotic stranger. David Koepp directed and Gavin Palone produced the picture, which also stars John Turturro, Ving Rhames and Timothy Hutton. "Window" has not yet been rated, but Blake said he anticipates a PG-13