Calder goes to England with his father, sees a Calder sculpture, which gets stolen, and Calder disappears! Did I mention the Calder exhibit in Chicago? Interesting, has puzzles, maps, pictures.
Zoomy comes into a mysterious notebook which seems to have something to do with Charles Darwin. Someone is trying to steal it. Zoomy and his friend try to figure out why. Excellent story!
Petra, Tommy, and Calder solve the mystery of a Frank Lloyd Wright house in Chicago. I still dont get pentaminos, but it is a pretty clever book. It did occur to me that living in the house, as a child, would possibly create unrealistic expectations about life. How about that?