Nancy Finds Mischief, Mystery, and Danger -- All Under One Roof! Nancy, Bess, and George have joined the Drews' housekeeper, Hannah Gruen, on a trip to San Francisco. They have come at the invitation of Hannah's friend Rose Green, who has asked their help in renovating a charming old Victorian mansion. But there may be other, uninvited guests as well: visitors from the past...spirits who want the place all to themselves. Nancy suspects that there...