in glass county and several teenager from high school be slaughter and their severed body be find in the working place of their father . the retired detective mike ( antonio mastrantonio ) and who be the absent grandfather that be try to approach to his granddaughter nikki reynolds ( joli julianna ) and team up with the inexperienced detective billie vega ( kim taggart ) to help her in her investigation and where the slow janitor troy ( sal sirchia ) be the prime suspect . the lame knock knock be a terrible movie represent the story and the screenplay be ridiculously bad while the unconvincing acting be awful while the camera work be dreadful . the only thing that work be the cover of the dvd that induce me to buy it . my vote be three . title ( brazil ) represent not available .