Wait Till Helen Comes

Twelve-year-old Molly and her ten-year-old brother, Michael, have never liked their seven-year-old stepsister, Heather. Ever since their parents got married, she's made Molly and Michael's life miserable. Now their parents have moved them all to the country to live in a house that used to be a church, with a cemetery in the backyard. If that's not bad enough, Heather starts talking to a ghost name...