Slasher School Days

After years of fighting monsters out to end her and steal the ancient artifact she guards Sally Sharp just spent a year in an asylum because the police don't take "they were possessed cultist zombies" as a valid reason for killing your parents and several hundred other people. Then one day she is approached by a man who offers her a place at his school. A school for supernatural murderers. Given the choice between more time in a straight jacket talking to psychiatrists who don't believe her story Sally takes the deal. Now she's in a school where everybody is killing everyone else but nobody stays dead. Evil plots are afoot, she cannot trust anyone, and she's got a project on advanced knife work due by the weekend. What is a girl who kills killers, murders murderers, and mangles monsters supposed to do when everyone in class is a serial killer out for her blood? Welcome to slasher school. All you have to do to graduate is survive...