Based on real events, in 1972 Juan and José are two textile workers from Tarrasa, Catalonia (northeast to Spain) who meet during an UFOs' convention. Both share their passion about the paranormal, specially about UFOs. In these years where was very much UFOs' sightings, they feel captivated by the mystery and start to investigate the diverse theories about the intentions or purposes of the sightings. Their friendship and the obsession they have will turn in dementia and paranoia, hurting their relations with their respective friends and familiars and exposing their lives to an extreme decision due to the conclusion of their own investigations.