Movie Story : Four former Spanish intelligence officers are killed in a coordinated wave of assassinations across the world. Investigators at Spain's CNI soon learn that each victim had taken part in a secret operation called Ciénaga, carried out in Colombia decades earlier. With the sole surviving member in danger, the agency's top operative, Zeta, is sent to find and protect him in what becomes the most dangerous mission of his career. Along the way he is joined by Colombian agent Alfa, who seems to know more about Ciénaga's secrets than Zeta does.