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"I read that book like 8 years ago. It was with teenagers living in dorms, some sort of boarding pr private school. Theres a mystery perpetrator who uses or has a graffiti tag. (i think it was on the cover of the book, red or pink) I only remember a boy and the main girl being in the dorm late at night, and his or her clothes are wet. And also one time she had to hide in the woods, maybe around some bridge. It was an R.L. Stine/Goosbumps vibe."