Nancy Drew and a stolen artifact

Friends call me Nancy Drew. Enemies are different, for example: A girl who ruined the whole thing to me. However, what else to expect from criminals? You see, I am a detective. Well, not quite. I have no badge and gun. But I always pay attention to injustice, deception
and vile acts and I know how to stop the villains. My friends and I went for a walk to the ARCCE National Park. Stunning natural arches of sandstone, beautiful weather, many paths on which, if not for the parking lots of the park, we would certainly have lost ... Although a minute ... It seems that we still got lost! Our puree went to check what kind of strange noise is heard near our route, and did not return. Something here is unclean