Ezequiel has assassinated Álvaro Trueba and has kidnapped Carla Ortiz, both the firstborn of the most powerful families in Spain. Jon agrees to be Antonia's squire. Even though they started off with the wrong foot, they're about to catch Ezequiel after a fast-paced chase that has everyone on edge. In her cell, Carla finds out that she is not Ezequiel's only prisoner.

Antonia and Jon have barely started and they have already got the Kidnapping Unit, Ramón Ortiz, Laura Trueba and the shadow leader of Reina Roja, Mentor, against them. During the course of the investigation, everyone lies. Antonia and Jon realize that what Ezequiel has asked of Ortiz and Trueba is an admission of guilt. But Ezequiel is always one step ahead and now his threat looms over Antonia.

Antonia's father accuses her of kidnapping her own son and is about to get her arrested, but Jon helps her escape. Alone and with all the city police behind her, Antonia seeks to hide in order to think of a rescue plan for her child. With the help of her memories, her mind, her old friends... and a costume, Antonia is about to take on the most important mission of her life.

Jon and Antonia get back together. The Queen and her squire have little time left and must go to underground tunnels riddled with traps and bombs. Sandra and Ezequiel are waiting for them and the lives of Jorge and Carla are at stake. But Antonia knows this is not over. Sandra is not who she says she is, but just a prophet of someone more powerful who already destroyed what Antonia loved most.