El fondo del mar

The student of architecture Ezequiel Toledo is obsessed by his girlfriend Ana, feeling a sick jealously for her. When Ana is invited to go alone to a party sponsored by her company, Ezequiel becomes paranoid. He arrives at their place unexpectedly and finds a man hidden under their bed. He follows the man trying to find his name and occupation, along a night full of incidents and misunderstandings. (imdb)