As a digital subscriber, you’ll receive unlimited access to Horn Book web exclusives and extensive archives, as well as access to our highly searchable Guide/Reviews Database.
To access other site content, visit The Horn Book homepage.
To continue you need an active subscription to hbook.com.
Subscribe now to gain immediate access to everything hbook.com has to offer, as well as our highly searchable Guide/Reviews Database, which contains tens of thousands of short, critical reviews of books published in the United States for young people.
Thank you for registering. To have the latest stories delivered to your inbox, select as many free newsletters as you like below.
No thanks. Return to article
(4)
4-6
Illustrated by
Wayne Geehan.
Cousins Per and Radius hunt for treasure by unraveling a Viking mapmaker's clues: a series of coordinates (x, y) that pinpoint locations on the Viking's map grid. Highway robbers, channeling the Keystone Kops, chase the cousins around, but this subplot comes off as rather superfluous. Acrylic paintings with a medieval setting illustrate this introduction to coordinate (a.k.a. Cartesian) planes.