The Old Willis Place book by Mary Downing Hahn 

From master storyteller Mary Downing Hahn, a chilling ghost story rich in secrets and surprises, in the tradition of her most successful spine-tingling novels.

Mary Downing Hahn weaves a tale of two children who live near a decaying Victorian mansion, bound to the place by a mysterious set of rules. Only by connecting with the new girl who moves into the old Willis place can Diana and little brother George be free—but making contact with this girl would be a violation of the rules. The pursuit of friendship is at the heart of this haunting novel, and brilliant plot twists make The Old Willis Place an irresistible page turner.