The Secret of Lost Lake — Carolyn Keene

In the Rocky Mountains, a witch is reputedly haunting the area where an isolated community was buried by a landslide forty years ago.

Jean and Louise, searching on horseback for a runaway show dog, try to fathom the mystery of the witch. A nefarious plot against the weird figure manifests itself in bizarre clues: a threat chipped in the stone wall of an ancient Indian cave and a message - "Get the witch!" sinisterly triple-echoed in a rugged canyon.

Who is this woman? Why does she frequent the site of the old disaster? Most important of all, who are the evil enemies pursuing her - and why?