As Arthur prepares for his first sleepover, his sister D.W. and all his friends are talking about the UFOs that have been sighted in the area. However, Arthur, Buster and the Brain don't let the rumours interfere with their plans for a backyard adventure in Arthur's tent.

In typical fashion, D.W. waits until the boys quiet down for the night and launches her own 'alien' invasion, and Arthur thinks of a way to beat her at her own game.

This book is part of a book series called Arthur .

There are 32 pages in this book. This is a picture book. A picture book uses pictures and text to tell the story. The number of words varies from zero ('wordless') to around 1k over 32 pages. Picture books are typically aimed at young readers (age 3-6) but can also be aimed at older children (7+). This book was published 2008 by Little, Brown & Company .

Marc Brown is the creator of the bestselling Arthur Adventure book series and codeveloper of the number one children's PBS television series, Arthur. He has also created a second book series, featuring D. W