I couldn't decide between 3 or 4 stars for this formulaic Dana Girls book. I finally gave it 4 stars because it is better than some of the stories.
As usual, the Danas are following several mysteries and they all have the same thread going through them: Oliver Pritz, or Dr. Gormley. You know the villain right from the beginning. Oliver has swindled about everyone he came into contact with. This is a winter story. The Danas meet Jasper Conway when they stop by his grocery store to get warm while ice skating. And they are there when the place catches on fire. They are able to save the contents of his safe, important papers, but they are stolen. Then Mr. Conway disappears. Along comes a wife looking for him. He abandoned her in California but she feels that her place is beside him. The Dana Girls nemesis Lettie causes plenty of mischief, as usual. The rusty key, by the way, was fashioned from an old spoon. Can spoons get rusty?