Ghost at the Drive-In Movie

Henry, Jessie, Violet, and Benny have never been to a drive-in movie theater before, but they're visiting a friend who owns one. The children love to eat popcorn in the car and watch movies under the stars. But strange pranks are disrupting the fun--one night the sound system starts playing loud music during the movie, and a couple of the theater employees seem to be hiding a secret. Then, late at night, a ghost is seen walking around the empty grounds of the drive-in! Could the old theater be haunted?