Campus police at the University of Wisconsin–Madison are baffled by the discovery of human remains in the attic of the administration building. Drawn into the investigation, visiting professor Nora Barnes connects the bones to the Vietnam-era bombing of Sterling Hall. But someone doesn’t want her probing the past. She’s side-swiped by a car while riding a bicycle and almost crushed in the art library’s motorized book stacks. Meanwhile, her high-spirited husband, Toby Sandler, is hot on the trail of lost architectural plans drafted by Frank Lloyd Wright.