Lucas Santos, alias The Saint (Antonio Resines), is fed up with going in and out of prison. He doesn't want to go on being a small-time thief all his life. Lucía (Neus Asensi), his wife, is a singer and dancer by profession. One day, The Saint decides to plan the robbery of one of the most representative works of modern art: Pablo Picasso's Guernica (painting) from the Museo Nacional Centro de Arte Reina Sofía.<ref name="filmaffinity">[http://www.filmaffinity.com/es/film523143.html El robo más grande jamás contado - Psinopsis] , filmaffinity.es.</ref><ref name="cineuropa">[http://cineuropa.org/f.aspx?t=film&l=en&did=22516 THE BIGGEST ROBBERY NEVER TOLD by Daniel Monzón], Europa.org.</ref>