In the year 1944, an artifact is used in a military experiment. The artifact is the Mask of Anhanga, the executioner of Tahawantinsupay, a Pre-Columbian God. The experience fails. Nowadays, the Mask arrives at Sao Paulo. The Mask possesses a body and starts to commit visceral sacrifices on vengeance for the incarnation of its God, initiating a blood bath. The policewoman Beatriz Obdias is in charge of the crimes, challenging her beliefs. A true mystical slasher film in the city of Sao Paulo.