Mo Willems, award-winning, New York Times best-selling creator of The Pigeon, Knuffle Bunny, and Unlimited Squirrels, presents best friends Elephant Gerald and Piggie.
Gerald is careful. Piggie is not.
Piggie cannot help smiling. Gerald can.
Gerald worries so that Piggie does not have to.
Gerald and Piggie are best friends.
In The Thank You Book!, Piggie wants to thank EVERYONE. But Gerald is worried Piggie will forget someone . . . someone important.