This is a story that works on many levels. Calder and Petra have to adjust the dynamics of their friendship when Calder's old friend, Tommy, returns. Their class becomes interested in the Robie House designed by Frank Lloyd Wright and, as the students learn about his architecture and personal history, readers are pulled into the learning with them. For those who liked the message hidden in the first book's artwork, there are more hidden surprises in this book. I enjoyed the variety of personalities among the characters - it makes it easier for each reader to find someone with whom they can identify. Most of all, I love how Ms. Hussey finds a way to nurture her students' cusiosity and abilities. Readers will probably think, "I wish I knew a teacher like that." It's a wonderful story and would be great fun to read and discuss with a friend.