At first I was like this is a crazy murder mystery to watching the entire season to actually get confused and putting the pieces together then BOOM my brain fart actually moved to it actually making sense. If you watch it, the show gives clues through the entire season. Maddie wasn't actually murdered. At the beginning of the season they mentioned how the other ghost had went into the after life. At the end it disclosed that Mr. Martin was experimenting the enitre time. BUT on what???? AH HA...Ill tell ya....He was experimenting on how a spirit can jump into another human body and it actually be viable. Well, When Maddie was in the place where she hit her head crying....she heard the ghost crying...as she opened the door the ghost that they mentioned at the beginning of the season who supposidely went into the after life ran and hit Maddie with so much force that her spirit went into Maddie's body and Maddie's spirit jumped out leaving her trapped in the school. (This is when Maddie hit her head and left the blood trace) So the person in Maddie's body is not really Maddie it is the ghost who has over taken her body. I am very interested in Season 2. I would like to see if they actually disclose and if Maddie gets her body back. Also, if they kill more people to get their spirits into those bodies.