This picture book was written and illustrated by the award winning Australian author Alison Lester. Each page has a door with the silhouette of someone knocking on the other side of a pane of frosted glass. The children in the story try to guess who or what might be on the other side each time? Monsters? Santa? Martians? A moose? The reader can lift the flap and open the door, revealing who is behind it.
I'm not normally a fan of 'lift the flap' style books since I found the flaps often get torn off by overenthusiastic little hands (I spent hours gluing bits back on Spot books that had to go back to the library!) but this book is sturdier than most because there is just one flap per page and it is securely anchored to the spine of the book rather than stuck on to the page.
The rhyming text and the guessing game aspect make this book a lot of fun to read aloud to a child. My three year old liked to shout who she thought was behind the door each time. The detail in the illustrations, which subtly show the passage of time in the story, gives you things to look out for as you read. I recommend it for kids aged two and up.
If you enjoy this one, Alison Lester has written another very similar book called I'm Green and I'm Grumpy.