Richard LaGravenese is directing the movie, which will be distributed domestically by Warner Bros. Pictures.

Hilary Swank and Gerard Butler star in the adaptation of 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. Marsters will play the late husband's best friend.