"Molly and her brother, Michael, try to make friends with their new stepsister, Heather. But Heather only wants to make trouble for them. She lies and tattles and misbehaves, and Molly and Michael always get the blame. They know Heather is trying to drive a wedge between her father and their mother--and it seems to be working. Then Heather starts playing in the graveyard behind their new house. She claims she can talk to a ghost named Helen, and her behavior gets even stranger. Michael doesn't believe in ghosts, but Molly isn't so certain, especially when Heather threatens that Helen is going to come for them and make them sorry. It seems as though things can't get any worse--but then they do. When Helen comes"--Back cover.