The action takes place in Madrid. The main characters are the spouses Carla and Marcos and their eight-year-old daughter Lua. They used to live together, but now Marcos has moved out. Carla is the leader of a counterterrorism unit, while Marcos is an officer. Used to following Carla's orders at work, Marcos can't understand why he tied his life to her both inside and outside the department. Carla is hiding a secret from Marcos. She needs to find out what the terrorists are planning before many lives are sacrificed. The heroine will have to make many difficult decisions...