Madrid, verano de 2010. La comisaria María Ruiz investiga el tenebroso crimen de un joven. Sin identidad visible y sin pistas ni móvil aparente, María comenzará una investigación que se irá haciendo cada vez más complicada.

Lasa y Zabala case was the first action headed by GAL "antiterrorist group", in 1983. Two Spanish policeman, following the direct orders of the general Rodriguez Galindo, kidnapped two ETA terrorist members, Jose Antonio Lasa and José Ignacio Zabala. Both policeman took the terrorist to La Cumbre palace, in San Sebastian (Basque Country), where they were tortured and interrogated. Later, they kill both terrorists and buried them in the city of Alicante, being their bodies found on 1985.