Four mathematicians who do not know each other are invited by a mysterious host on the pretext of resolving a great enigma. The room in which they find themselves turns out to be a shrinking room that will crush them … Lluís Homar, Santi Millán, Alejo Sauras, Federico Luppi, Elena Ballesteros, Helena Carrión, Núria Badia Added on Amazon Prime 2020-09-17. Youtube Trailer