The Dream Walker — Charlotte Armstrong

An unscrupulous actress is perpetrating a supernatural hoax that has stunned the country. She's the Dream Walker - a mysterious apparition who shows up in two different cities at the same time, then disappears, untraceable. Olivia Hudson, an acting teacher at a private Manhattan girls' school, considers this no more than a mean-spirited prank born of desperation and blind ambition. Until, that is, it tarnishes the deservedly spotless reputation of a beloved, but famous, family friend. Now, Olivia respects a good actress, but when this woman's antics begin to involve murder... someone has to intervene. Someone who can best an actress at her own game... to escape with her life!