Perfect for children just learning to read, this highly original book is told entirely in speech bubbles with a repetitive use of familiar phrases.From the award-winning author of Don't Let the Pigeon Drive the Bus!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. This is the final story in the hilarious and award-winning series by Mo Willems, king of early-years comedy.