George the Janitor by Christopher C. Page

Ever since GA Ratcliff High School closed in the eighties amidst the George Ross Scandal, local residents have been drawn back to the place, but not everyone who visits gets to leave. Urban explorers continue to roam its halls, some for sport while others seek the truth. Amateur ghost-hunters and television personalities go in looking for answers, but what they find lurking within is deadlier than any of them could have imagined.