Gerard Butler has been cast opposite Hilary Swank in the drama, P.S. I Love You for Alcon Entertainment and Warner Bros.

Richard LaGravenese is directing the movie, which is based on the best-selling Cecelia Ahern novel, about a grieving young widow who discovers her late husband has left her a list of tasks revealed in 10 monthly messages that are intended to ease her out of grief and transition her to a new life, says The Hollywood Reporter.

Production for P. S. I Love You is scheduled to begin next month for a 2008 release.