By Blue Balliett, Illustrated by Brett Helquist

Category: Juvenile Fiction, Ages 9-12, Mystery
Publisher: Scholastic Press
Format: Hardcover, 318 pages, Illustrated
Pub Date: April 2006
Price: $16.99
ISBN: 0439693675

From the Publisher:

Spring semester at the Lab School in Hyde Park finds Petra and Calder drawn into another mystery when unexplainable accidents and ghostly happenings throw a spotlight on Frank Lloyd Wright’s Robie House, and it’s up to the two junior sleuths to piece together the clues. Stir in the return of Calder’s friend Tommy (which creates a tense triangle), H.G. Wells’s The Invisible Man, 3D pentominoes, and the hunt for a coded message left behind by Wright, and the kids become tangled in a dangerous web in which life and art intermingle with death, deception, and surprise.

Blue Balliett lives with her family in Chicago, Illinois.