Owen discovers Rose's journal in the attic, detailing a 13-year cycle of deaths tied to a supernatural entity called "Crimson Grin." The journal documents that every 13 years for 13 days (October 15-27), a killer clown entity awakens and hunts teenagers in Ravenswood.
Owen sees Crimson Grin outside his window on Day 1-a white-faced, black-eyed, red-smiled entity wearing a Victorian-era clown costume. He realizes the pattern is beginning again.