SOCO probes the gruesome crime that led to the death of a 16-year-old female in Victoria, Oriental Mindoro in December 2012. "Nila" recalls the day her daughter Mary Grace went missing after leaving to attend the sixth Simbang Gabi mass at a church near their residence. Later that day, a carpenter stumbles upon the remains of a teenage girl at a cemetery, which was eventually identified as Mary Grace. Authorities then start their probe and gain a significant lead linking a relative to the victim's ghastly killing.