Type-A personality, Ava, owns “Rent-an-Elf,” a business in which she sets up a memorable Christmas for busy families. This year, she's hired by the newly-single Liam and falls for him and his adorable son, Nathan. But, just as Ava thinks she’s found her match, Liam’s ex-wife returns, wanting to patch things up. Even though Ava decides to put Liam and Nathan's happiness above her own, she's still determined to give them the best Christmas ever, and maybe even hope for a Christmas miracle or two.