Deadly Vision by Teresa Keefer

The sleepy little college town had all but forgotten the girl who disappeared twenty years ago. People had passed on or moved on, and the only reminder were the annual news stories of the girl who had never been found.
Her family hadn’t forgotten.
The young man who sat next to her in the chemistry lab hadn’t forgotten.
A reclusive medium hadn’t forgotten. The girl had been coming to her over the last few months.
Sometimes, sleepy little college towns had secrets that once uncovered could destroy the very foundations from which they were built. This town’s secrets were deadly.