This book tells the story of how Francis Scott Key's poem became our national anthem. The story is told in a simple and beautiful way. Francis, who was a lawyer, boarded a ship in hopes of freeing his friend, who was being kept a prisoner by the British. He wrote the Star Spangled Banner while aboard the ship, as he witnessed a battle between the Americans and the British. As he wrote the poem, he anxiously wondered who had won the battle, and kept looking to see whose flag was still flying. When did it become the national anthem? Read this book to find out this and other interesting facts about our beloved anthem.