Based on real events, Francesc Boix is a Spaniard inmate in the Nazi concentration camp of Mauthausen in Austria who tries to save the evidences of the horrors committed inside its walls.Based on real events, Francesc Boix is a Spaniard inmate in the Nazi concentration camp of Mauthausen in Austria who tries to save the evidences of the horrors committed inside its walls.Based on real events, Francesc Boix is a Spaniard inmate in the Nazi concentration camp of Mauthausen in Austria who tries to save the evidences of the horrors committed inside its walls.