Who Sleighed Grandma?

Your team NPCSI (North Pole Crime Scene Investigators) have been brought in to investigate the gruesome murder of Grandma. Witnesses say that she was run over by a reindeer and all evidence points to one Saint Nick, AKA Santa Claus. Mr. Claus maintains his innocence; he claims he was enjoying milk and cookies at the time of the incident. It is up to you to get to the bottom of this horrific crime. Prove Santa is innocent or he will spend the rest of his life behind candy cane bars!