It's a strange Spanish thriller filmed in Poland; the performances of its protagonists are very good, so the film has a great cast of actors (the Oscar-nominated Javier Bardem, Carmelo Gómez, María de Medeiros...). But people uses to find this film very strange by the violence scenes and the supernatural presence of the roles of Javier Bardem and Carmelo Gómez. It's a recommendable film if you like odd films.