Amazon.com Product Description (ISBN 0142001848, Paperback)

An exhibit of the work of the Dutch artist M. C. Escher is being held in Cambridge, Massachusetts, home to amateur sleuths Homer and Mary Kelly and their friend Leonard Sheldrake. At the exhibit, Leonard, an avid Escher fan, falls instantly in love with a woman in a green coat who is equally enthralled by Escher's brilliance. To Leonard's dismay, she hurriedly leaves the exhibit, hinting to him that if he knew her better, he would not love her. Homer and Mary offer to help a now desperate Leonard find the woman but end up in an Escher-like labyrinth of their own. Enhanced with Escher illustrations throughout, Langton creates a world where every line, curve, and angle lead to murder.