When a Stranger Calls & The Sequel When A Stranger Calls Back 

When a Stranger Calls
During an evening of babysitting, high-school student Jill Johnson is terrorized by a caller who keeps asking “Have you checked the children lately?” When she calls the police, they inform her that the calls are coming from inside the house.

The Sequel When A Stranger Calls Back 
Before there was Scream, there was The Stranger Jill Schoelen is Julia Jenz, a college student trying to put her life together after undergoing a terrifyingly similar ordeal while baby-sitting five years earlier. When someone begins stalking Julia, the police think she's just a hysterical coed, but Jill Johnson, the campus director of women's services, knows that such things happen - she's been there. Jill recruits retired detective John Clifford, and old friend who saved her life thirteen years ago, in an effort to nail the stalker, but can they find and outwit the culprit before it's too late to save Julia? ...When a Stranger Calls Back