Mild high school horror flick based on Frank Peretti’s supernatural book for youths

I originally saw this 2003 movie on DVD a couple of years after its release and, preparing to re-watch, I couldn’t remember anything about it, except the wacky professor, played by the author of the book, Frank Peretti, who comes across as a shorter Dr. Emmett Brown from “Back to the Future.” I saw an interview with him and he really IS as eccentrically animated as he appears in the film.

The plot revolves around a Spokane, Washington, high school, which is supposedly haunted by the ghost of a kid wh... read the rest.