Lunar Chronicles

I was at my junior school and there were many security guards. There were gunshots and when everyone went to check it out they found a dead security guard. It was my job in the dream to find out who did it. It took me ages but I finally figured out that it was an inside job. After I found this out everyone started looking for the culprit. Eventually the bad people came out and told us that they will come back later. T came out from the building and he started talking to me. The dream then faded.