Summer of Fear

by Lois Duncan

Published 1 September 1976
Soon after the arrival of cousin Julia, insidious occurrences begin that convince Rachel she is a witch and must be stopped before her total monstrous plan can be effected.

Stranger with My Face

by Sexton and Lois Duncan

Published 1 October 1981
A seventeen-year-old senses she is being spied on and probably impersonated, but when she discovers what actually is occurring, it is more unbelievable than she ever imagined.

The Twisted Window

by Lois Duncan

Published 1 May 1987
Tracy, a high school junior, becomes embroiled in the problems of a strange boy, who asks her assistance in "snatching" his half-sister from her father who has allegedly kidnapped her.