Drew, whose animated doodles rarely stay on the page of her sketchbook, must rein them in while on a trip to the Art Institute of Chicago.

Ruthie thinks nothing exciting will ever happen to her until her sixth-grade class visits the Art Institute of Chicago, where she and her best friend Jack discover a magic key that shrinks them to the size of gerbils and allows them to explore the Thorne Rooms--the collection of sixty-eight miniature rooms from various time periods and places--and discover their secrets.