Knock-knock! Trick or treat ... which will it be? A monstrously sweet lift-the-flap book from the acclaimed creator of Gustavo, the Shy Ghost.

It's Halloween time, and Shelley can't wait to play Trick-or-Treat! Knock-knock! What’s behind this first door? It’s a ... TRICK! It's Gustavo and his creepy-crawlies! How about the next door? Knock-knock! It’s a ... TREAT! It's Mandy Mandrake with her beautiful jack-o’-lanterns!

Little readers can happily “knock” on each door, lifting the flaps to discover tricks or treats. With a fun, join-in element and bright, cheery illustrations, Flavia Z. Drago weaves in cameos by characters from her other books to make this a Halloween treat for old fans and new friends. The perfect gift for a new arrival, and an original and stylish addition to any baby or toddler’s library.