Gonzalo García Pelayo (Lluís Homar) has been trying for years to work out a system to legally win money in a local casino, which is run by the infamous The Beast (Eduard Fernández). When he realizes he has succeeded in doing so, using a system based on wheel bias, he drags his family in to help — son Iván (Daniel Brühl), daughter Vanessa (Marina Salas), their cousins Marcos (Oriol Vila) and muscle-bound Alfredo (Miguel Ángel Silvestre), and family friend Balón (Vicente Romero).