On the first day of Christmas:

Lady Miranda Archer accepts a marriage proposal.

On the first day of Christmas, fifteen minutes later:

Miranda realizes she’s made a huge mistake.

For the next twelve days:

Miranda must find a way out of her engagement—which is harder than it looks, especially since her fiancé is pompous, mean, and desperate for her family’s jewels—and convince her true love that all she wants for Christmas is him.