Multi-award-winning, New York Times best-selling duo Mac Barnett and Jon Klassen conspire again on a slyly funny tale about some very sneaky shapes. Meet Triangle. He is going to play a sneaky trick on his friend, Square. Or so Triangle thinks... With this first tale in a new trilogy, partners in crime Mac Barnett and Jon Klassen will have readers wondering just who they can trust in a richly imagined world of shapes. Visually stunning and full of wry humor, here is a perfectly paced treat that could come only from the minds of two of today's most irreverent—and talented—picture book creators.

This book is about Square. Square spends every day taking blocks from a pile below the ground to a pile above the ground. This book is also about Square's friend Circle. Circle thinks Square is an artistic genius. But is he really?

Mac Barnett and Jon Klassen deliver the final tale about Triangle, Square, and Circle. This book is about Circle. This book is also about Circle's friends, Triangle and Square. Also it is about a rule that Circle makes, and how she has to rescue Triangle when he breaks that rule.