Six young college students travel to São João da Cruz to celebrate their acceptance into a prestigious academic association. The fun gives way to terror when a hazing ritual is taken to the limit and the youths drown under suspicious circumstances.
Marta, the sister of one of the victims, is convinced that the fatal accident was a crime perpetrated by the association’s leader, and only survivor, Gonçalo Vilar. Marta’s obsession puts her on the trail of the association that wants to prevent her from reaching the truth at all costs.