Twelve young adults held their Middle School Reunion in an isolated Mansion. But, there are rumors saying that whenever they do that, a 13th person would appear and kill them off one by one until only the three of them left. Will that become true? Yes, she was the one left behind ungraduated that year. Can they prevent it? Depends, There are too many wannabe detectives here! If not, who will survive? Here is not just a 12 vs 1 battle of wits.