Must be Christmas focuses on a little girls' love of the beautiful trumpeter swans that make their winter residence in the fields behind her home. Taylor marks time according to the return of the swans, whom she dearly loves, and knows it must be near Christmastime now that they have returned. Taylor wants to make them feel welcomed, but when it snows, she is concerned for the welfare of a little cygnet named Stella-Rose. What she does to address both issues will warm your heart.