Antonia Scott is the linchpin of the Red Queen project, created to work behind the scenes to solve the most devious and dangerous crimes. But she is unwilling to move past the last case, convinced it’s related to a personal tragedy, until a series of deadly events pulls her back in. In southern Spain, a key mafia figure is found brutally murdered in his villa. His pregnant wife, Lola Moreno, barely escapes an attempt to kill her in a shopping mall and is on the run. A shipping container from St. Petersburg arrives in port in Spain containing the corpses of nine women, all of whom suffocated. Now Antonia, with the help of her helper and protector, Jon Gutierrez, must track down Lola. But a dangerous contract killer, known as the Black Wolf, is also on her trail.

Antonia Scott, the daughter of a British diplomat and a Spanish mother, has a gifted forensic mind, whose ability to reconstruct crimes and solve baffling murders is legendary. But after a personal trauma, she's refused to continue her work or even leave her apartment. Jon Gutierrez, a police officer in Bilbao --- disgraced, suspended and about to face criminal charges --- is offered a chance to salvage his career by a secretive organization that works in the shadows to direct criminal investigations of a highly sensitive nature. All he has to do is succeed where many others have failed: Convince a recalcitrant Antonia to come out of her self-imposed retirement, protecting her and helping her investigate a new, terrifying case.