In 1877, as Spain struggles to rebuild after a devastating civil war, decorated war hero Rafael Duran is appointed to the nation's newly formed Agencia Secreta, an elite intelligence service created to confront threats beyond the reach of ordinary law.

Haunted by the memories of war and the woman he has never stopped loving, Duran is assigned to investigate the mysterious deaths of two powerful noblemen. What begins as a routine inquiry soon uncovers a web of secret societies, political intrigue, and an international conspiracy capable of tearing Spain apart.

As the conspiracy closes in, the line between duty and love begins to disappear. To save the woman who still holds his heart, Duran must confront the ghosts of his past and stop an enemy willing to ignite another war.