Students Hayley and James are young and in love. After saying goodbye for Christmas at a London train station, they both make the same mad split-second decision to swap trains and surprise each other. Passing each other in the station, they are completely unaware that they have just swapped Christmases.

Across different eras, a poor family, an anxious developer and a fed-up landlady become tied to the same mysterious house in this animated dark comedy.

To win his true love's heart, wide-eyed Tristan Thorn journeys to a forbidden realm to retrieve a fallen star that has taken human form.