Fermat's Room

“Think inside the box.”

Four strangers get the same invitation: come to a house and help solve a great enigma, under a pseudonym borrowed from a famous mathematician. Hilbert (Lluís Homar) and Pascal (Santi Millán) are among the guests, and once they are locked in a room with a host who calls himself Fermat, the walls begin to close. Luis Piedrahita and Rodrigo Sopeña keep the group close, and what they owe one another matters more with every move the walls make.