When General Washington crosses the Delaware on Christmas Eve, he does so with the aid of mermaids. In a vision, today's President Tolvar MacLeod observes the historic event and decides to commemorate it by inviting a modern-day mermaid to his annual Christmas Ball. Melanie McKenzie, mermaid extraordinaire, receives that invitation while hiking in the Rocky Mountains of Colorado and decides to go. With the help of Belfast, an intelligent deer, she makes her way to Washington, D.C. Unfortunately, trouble follows Melanie wherever she goes, it seems, and the Christmas Ball would be no exception. Can our mermaid avoid trouble, heal a divide between her and her BFF and successfully dance with a deer? She might possibly handle one of them, but certainly not all three.