The perimeter and area of a circle might just unlock a secret!

When young Per visits her uncle Sir Cumference and his family, she learns how to play the game, "Inners and Edges." After she finds a clue linking the game to the mysterious castle on the island of Immeter, she must figure out how to find the perimeter and area of a circle to unlock the island's secret.

This book teaches beginners how to find the area and perimeter of a rectangle and a circle, and introduces an underlying concept of calculus: using straight lines to measure curves.