For years, girls have wished for a movie about their favorite American Girl. Finally, that wish comes true in the first-ever, full-length, live-action movie starring long-time favorite Samantha Parkington. Samantha's prim and proper Grandmary is raising her to be a lady, but her life starts changing the day she meets Nellie O'Malley, the servant girl next door. Though they come from different worlds, they become fast friends, facing happiness and sorrow, adventure and danger together. But nothing can prepare them for the life-altering surprises that await them this holiday season.