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Boo guess who elmo 1.jpg
Illustrator Ernie Kwiat
Published 2015
Publisher Reader's Digest
Series Guess Who
ISBN 0794434754

Boo! Guess Who, Elmo! is a 2015 Sesame Street storybook about Elmo and his Sesame friends trick-or-treating on Halloween. As Elmo encounters each new friend, the reader is invited to guess who the character is behind the costume -- and then lift the flap to see who it is.

Characters: Elmo as a dalmatian, Cookie Monster as a cookie, Ernie as a pirate, Bert as a bird, Abby Cadabby as a ladybug, Big Bird as a police officer, and Oscar the Grouch and Slimey as ghosts.