Sofía and Daniel’s life looks promising and happy until Daniel receives an enigmatic invitation to meet his biological mother in an East Berlin immersed in the Cold War. Unbeknownst to him, accepting that invitation will become the biggest mistake of his life since it will become the essential piece of the KGB’s secret plan to establish its operational center in Francoist Spain and in which his twin brother, Klaus, will play a key role, usurping his identity, his family and his entire life. From that moment on, Sofía will live in constant suspicion.