A police officer contacts the most intelligent woman in the world to solve a case that will put her abilities and her past to the test.

Jon can't get rid of the Mentor, who puts him on the Red Queen project and appoints him Antonia's squire. The work begins, but Jon still can't convince Antonia to rejoin the experiment.

After talking to Laura Trueba, the only thing that becomes clear to Antonia and Jon is that the kidnapper has asked the banker for something impossible. Antonia can't forget the phrase that came up in the conversation and goes into one of her crises.

Antonia wakes up alone in front of a mural. The killer only wanted to deliver a message. A message that leads Antonia and Jon to a taxi and to discover Ezekiel's true identity.

Antonia and Jon discover that Ezequiel's daughter has been helping him; Carla Ortiz discovers the terrible truth about the woman in the other cell; Jon's unforgivable mistake causes Mentor to close the case and remove Antonia from command.

Antonia's father accuses her of kidnapping his own son and is about to arrest her, but Jon helps her escape. Alone and with all the town's police after her, Antonia hides and thinks up a plan to rescue her son.