A full moon comes once every month: The lunar spectacle illuminating the sky with an accompaniment of howls. You've been with your boyfriend, Ronan, for over a year and, once a month, he disappears - his absence filled by the comforting light of the full moon. Tonight, however, is different.

Ronan has locked himself in the downstairs bathroom, muffled whines and groans slipping past the locked door - he's always been independent, refusing help when it's given. You're worried.