Wait Till Helen Comes (Used Paperback) - Mary Downing Hahn

The spine-chilling tale begins when twelve-year-old Molly and her ten-year-old brother, Michael, learn that they’ll be moving to a refurbished old church in rural Maryland with their mother’s new husband, Dave, and their younger stepsister, Heather. Heather is an insufferable brat, but that turns out to be the least of the family’s worries. When she strikes up a friendship with Helen, the malevolent ghost of a seven-year-old girl who died in a mysterious fire more than a hundred years ago, things really heat up . . . and Heather’s unsettling threat, “Wait till Helen comes,” becomes a grim reality.