Lori I agree; the ending is rather confusing. I read it through a few times; however, I think what other responders here have said is correct: the "ending" (i.e. Holly going off to see Moran) is a flashback to the girls' point of view. The ending ties up the mystery of how the card got to the Secret Place to begin with. The others girls believe Selena posted the card, but we find out differently through Holly's memories. As for the one who killed Chris...that seems to be very clear.