When Michael attempts suicide and doesn’t leave a note, he inadvertently awakens Hattie, a demon that haunts the psychiatric hospital he's in. Now he must find a way to stop her rampage before she kills everyone he connects with.

A collection of 24 films that take a look at the dark side of the festive season. 24 international directors with the most diverse ideas and styles; linked by short animated segments that deal with the Advent calendar itself.