The body of a rock climber appears in the sanctuary of San Miguel, in the Aralar mountain. Everything seems to indicate that the destructive storm Cordelia has been to blame for her death. However, the young forensic expert Aitor Intxaurraga goes to the scene of the incident and discovers something strange on the woman's body. Her death may not have been accidental. Finding the truth will mean opening the door to a dark and elusive force that has remained hidden for so many years.