Rodrigo Sopeña
After a complicated divorce, Gabriel rents a remote house to live by himself. In one of the rooms he finds a strange box which contains different objects, each of which relates to an unresolved crime. Finding the connection between the victims and working out who the killer is become his obsession.
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 if they do not discover in time what connects them all and why someone might wish to murder them.
