Shadow of Honor (Tom Clancy's Net Force; Young Adults, No. 8)

Andy Moore never knew his father, who was killed during the South African War ten years ago and proclaimed a hero. But now a rival student has revealed information that brands Andy's father as the perpetrator of a massacre. As he struggles to find the truth about his father, bad things start happening at his school--things that put every student there at risk. It's clear that Andy isn't the only one interested in what really happened in South Africa. And if Andy doesn't figure it out soon, it might just be too late...for everybody!!