Lily is a small but incredibly sturdy sailboat living in a very busy harbor. Every day, she shares the water with massive cargo ships, zooming fishing boats, and bossy tugboats. Because she is so little, the bigger vessels constantly honk their loud horns and tell her to get out of the way. But today, Lily has an important place to be. A fleet of beautiful, silent tall ships is arriving, and they need to pass under the harbor's lift bridge. Because the tall ships do not have horns, they cannot ask the bridge to rise. Lily knows she must help! Braving the choppy waves and the booming blasts of the giant ships, Lily uses her own little horn to signal the bridge. Through plucky persistence and courage, the littlest boat saves the day and proves you do not have to be big to be a hero.