Lois Duncan Thriller Set: Down a Dark Hall, Ransom, Summer of Fear - Vintage Paperbacks

Down a Dark Hall: 

Why does the exclusive boarding school Blackwood have only four students? Kit walks the dark halls and feels a penetrating chill. What terror waits around the next corner?

In Ransom, the lives of five captives hang in the balance while their families gather the ransom.

Two brothers, their family frantic to find their sons. A loner whose uncle doesn’t even know he’s missing. An Army brat whose family will never be able to raise enough money. And a cheerleader who can’t count on her stepdad, but knows her father will come through.

In Summer of Fear, Rachel seems to be the only one to sense the evil that surrounds Julia. 

From the moment Rachel's cousin Julia arrives that summer, she seems to seep into Rachel's life like a poison. Everyone else is enchanted by her - including Rachel's boyfriend. But what does Julia really want?