Barbie stars as Corrine, who longs to join the Musketeers. When she leaves her country home for Paris, she meets three other girls who want to be Musketeers, too. But when they discover an evil plot to kidnap Prince Louis, they must all put their talents to the test to save him and the kingdom! Can Corrine and her friends save the prince in time, and will they all fulfill their dreams of becoming Musketeers? After all, with friendship on their side, it is one for all and all for one.