The brutal murder of a man, presumably at the hands of his son Marcos, a teenager with no apparent problems, disturbs the daily life of a high school where students and teachers wonder what has gone wrong for this popular, almost perfect boy to end up committing such a crime. The investigation uncovers what is happening to the enigmatic young man and his environment, from his best friends to his life at school and the difficult family events he has had to deal with in recent months. Everything will lead to finding out if Marcos really was his father's murderer.