Antonia Scott is the most intelligent woman in the world –a virtue and a curse at the same time. Her intelligence allowed her to become the "Red Queen" of a secret experimental police project. But a personal tragedy removed her from active duty. Now, Jon Gutiérrez, a police officer in trouble, has to get her out of her seclusion to solve a case that will put her abilities and her past to the test.

Antonia wakes up alone facing a mural. Why didn't Ezequiel kill her? The assassin wanted to deliver a message. A message that leads Antonia and Jon to a taxi car and to discover the true identity behind Ezequiel. The Kidnapping Unit has also found Ezequiel's address and taxi car, but Antonia notices that the pieces don't fit together as neatly...