What if … you let a stranger into your house to use your phone, but while you’ve been patiently waiting in the kitchen, he just disappears … or does he? Félix, an architect who has just split up with his girl-friend and inhabits a huge mansion in Barcelona, finds out how many hiding places there really are in his house. But are there enough to hide another person, a strange parasite of living space? Or is Félix really going insane?