The Harry Potterseries has a happy ending, in part, thanks to Narcissa Malfoy, but the books and movies don't get too explicit about why Draco's mother lies to Voldemort and saves Harry's life.
One such moment from the series’ final film, Harry Potter and the Deathly Hallows Part 2, is the scene in which Narcissa (Helen McCrory) of the usually villainous Malfoy family lies to Lord ...