The Zodiac Trilogy: One year, one sign, one crime. January 2012 and the start of the Year of the Dragon, the only mythological animal in the Chinese Zodiac, which represents wisdom, power and wealth. After ETA announces the permanent end of its armed activity, life in the idyllic city of San Sebastián flows smoothly without serious crimes. But the situation changes drastically when the decapitated body of a young undergraduate student from the Chemistry Faculty is found. Responsibility for the investigation is given to Max Medina, an inspector with the Ertzaintza's homicide team, whose strong personality will clash with those of his new colleague, the recent graduate Erika López, and the forensics officer Joshua O'Neill. The crimes will take place in the Year of the Dragon, a sign connected with natural disasters and tragic events.