Young Caroline Pickersgill lives with her mother and grandmother in Baltimore, Maryland. Mrs. Pickersgill, a widow, supports herself and her daughter by making flags for the ships that sail into the city. Some soldiers from Fort McHenry come to her to order the biggest and best flag in the world, and Caroline helps make it. When the British sail up the Chesapeake Bay to destroy Baltimore during the War of 1812, the defenders at the fort beat them...