If you are not a detective, you may still have to play one especially if you read mysteries. The mystery books allow the average citizen to try to figure out who the killer is in the story. There will be clues given and the reader will have to figure out how the clues point to the killer. In this situation, a man is killed in his office.
There are a few suspects that have been determined based on the evidence and the people who probably know the victim. These include Edison, Maxis, Jason, Janna, Sofia and Patrick. After investigating, the calendar on the wall has numbers written on it in blood. They are six, four, nine, ten and then eleven. This is probably a clue. Therefore the killer is Jason.