Ex-Pat American Jacob Moore is looking forward to hosting his traditional Christmas Eve party with his partner, Errol. They love the quiet night of friends and food at their house in London, and the break before dealing with family, presents, and Boxing Day. The quiet is shattered when Jacob's younger half sister, Pru, shows up on his doorstep, running away from home for a very good reason. Jacob has stayed in touch with her over the years, even though he's estranged from their father. But nothing prepared him for this. Now he has to decide what to do with this unexpected package from Father Christmas.