Babysitter, The (#1-2 Anthology) by R.L. Stine - Vintage Point Horror

For Jenny, baby-sitting is like one bad dream after another. From her first job at the Hagen sitting jobs she takes haunted by someone evil, calling her on phone... trying to scare her... to death.

He's back. Jenny's last baby-sitting job nearly killed her—for real. But she's a survivor. She's getting over it. The crazy guy who was after her is gone. She's even got a new baby-sitting job. Then the phone rings. When she answers, she hears a familiar voice. A voice from the past... from the grave...

"Hi, Babes, I'm back."