One dance, once a year.

This defines Marta and David's friendship from the moment they first meet at the Yuletide Ball. Now, dancing the annual Christmas Waltz is a tradition between the pair in which they agree to tell each other the truth about their lives. Over the years that follow, their lives take different directions, wrong turns, and heartbreaking spirals, but they never miss their chance to reconnect and encourage one another to live their best lives, even if they can't live them side by side.