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After resolving a test with a sequence of numbers, four mathematicians are challenged by a mysterious man called Fermat to meet in an isolated place to resolve the greatest enigma ever. Each one receives a code name - Hilbert, Pascal, Galois and Oliva - and heads to a barn in an island. Inside the barn, they find a comfortable room, and sooner their host arrives. They have dinner together and Fermat receives a phone call from the hospital where his daughter in interned in coma. He asks to leave the place for one hour; however, after his departure, the quartet finds that they are locked up in the room. They receive a phone call with a mathematical riddle, giving one minute to their reply; sooner they find that if they do not answer to the questions, the walls move and room shrinks pressed by four Poseidon hydraulic presses. While responding the questions, they try to find the motives why they have been gathered together to be killed.

Genre(s) : [Mystery

Actors :
Alejo Sauras Galois
Elena Ballesteros Oliva
Lluís Homar Hilbert
Santi Millán Pascal
Federico Luppi Fermat
Ariadna Cabrol Girl
San Yélamos Girl
Alicia Fernández Girl
Cesc Cornet Boy
Juanma Falcón Boy
Adam Nached Boy
Josep Minguell Doctor
Helena Carrión Librarian
Maria Piedrahita Fermat's Daughter
Víctor Benjumea Gas Station Attendant
Núria Badia Receptionist
Mariola Ruiz Nurse
Maria Cisneros Guard
Daniel Garcia Guard
Mar del Hoyo Oliva's Friend (scenes deleted)
Eloy Arenas Shop Assistant (scenes deleted)