Bliss by Lauren Myracle

Bliss In The Morning Dew, who has been raised in a commune, finds herself living with her proper Southern grandmother when her parents skip out to Canada to avoid the Vietnam War. Bliss's grandmother has enrolled Bliss in the prestigous Crestview Academy for high school. But Crestview has a history and Bliss with her sixth sense hears and feels an evil ghostly presence in one particular school building. Bliss's new friends have a history too. Bliss, set in the '60s, brings together many issues of the time, as the tale gets creepier and creepier.

Wait Till Helen Comes by Mary Downing Hahn

When Molly and Michael's mom remarries and they have to move with her new husband, Dave and his daughter Heather to the country, they are not overjoyed. This has spoiled their summer plans with friends. Living in the country is boring compared to the big city but they try to make the best of the situation by exploring their new environment. The family's new home is an old coverted church which comes with its own graveyard. Molly notices a change in Heather's behavior after a visit to the graveyard and the discovery of a small tombstone. Strange things begin to happen around the house and Heather blames both Michael and Molly. Tensions begin to rip the family apart. Heather continues to manipulate the adults and threaten her new siblings with "Wait till Helen comes!"