Criminal intent

Bobby Green is an agent usually just does the research at a crime investigation. This one however is personal and he knew all about it. It was his grandpa Max Green. He was a retired general from the army in deployed in the Vietnam war where he made a lot of enemies. One in particular was a man he wronged more than once and he had been with him that day. The first time he was doing his duty to save his own s by rescuing them from a burning building and leaving his aunt behind. However, this did cost his grandfather his leg. The second time was more personal when he was commanded to kill his family unaware of the connection. He found out the connection when they both researched everything about what happened in the war and his grandfather was curious who the victims were. Another man may be the mastermind that also saw his grandfather that day, He was Bobby's best friend's grandpa. Was this revenge? Will he solve the case before the killer gets away.