Ellie Pearce adores Christmas so much she celebrates all year round, earning herself the nickname Christmas Girl. If only she liked her job as much as eggnog lattes and mistletoe. Stuck as a marketing analyst for London-based recruitment company Caldwell & Atkinson, Ellie is desperate for a career change but afraid to take a chance. CEO Rosalind Caldwell needs a new personal assistant after the last one quit, putting the extremely important corporate Christmas party in jeopardy. Christmas Girl is just the holiday miracle Rosalind needs, and Ellie is quickly promoted to the top floor of the Canary Wharf skyscraper. Ellie isn't a PA, has never planned a party in her life, and is terrified of heights. If things weren't bad enough, she then goes and develops a ridiculous crush on her totally intimidating new boss. With the festive season fast approaching, what could possibly go wrong?