España. 2007. Color. 88 min. Ficción. 35mm.
- Film Director
: Luis Piedrahíta; Rodrigo Sopeña. - Producer
: César Benítez; Adolfo Blanco; José María Irisarri.
Four mathematicians who don't 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 if they don't discover in time what connects them all and why someone might wish to murder them.