Back in San Sebastián, Laia Ortiz is selected to serve on the jury in the most high-profile trial in recent years. The victim is Borja Miranda; the defendant, Lander Foronda, the son of a powerful San Sebastián property developer involved in a recent real-estate scandal. The case seems very straightforward: two roommates, a relationship gone sour, documented blackmail, seemingly clear evidence, and a defendant facing overwhelming public hostility. Silvia Legarre, a former prosecutor, disagrees. Determined to defend her son’s best friend, she will pursue a risky defense strategy that will put the jurors to the test and raise a more than reasonable doubt: is Lander guilty, or was this crime committed by the serial killer who terrorized the city years ago and has now struck again?