MYRTLE: While my knowledge of what is up there is limited at best, and I am unable to learn any more due to the area being sealed against ghosts, I do know three things for certain (she pauses, then holds up her hands and counts them off against her fingers) A number of staff know about it, including the four Heads of House, whatever it is must be quite old and valuable because they have been talking about protecting it and finally I believe that whatever it is arrived just before the start of term, because that’s when the wards against the ghosts first went up.