It’s winter holidays and fourteen-year-old Ana discovers that the metal plate she has in her arm from an accident she suffered as a child is now receiving a strange message in Morse code.

An architecture student is obsessed by his girlfriend. When she is invited to go alone to a party sponsored by her company, he 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.