Originally published as Opal Moonbaby Forever, this is the third book in a funny, warm-hearted series about friendship - and aliens! If you love Jacqueline Wilson, Cathy Cassidy or Liz Kessler, you'll love reading about Opal Moonbaby.

Martha's best friend is an alien. Opal Moonbaby can move things with her eyes, make popcorn fountains, and travel all over the world in her very own spaceship. Martha can't imagine life without her.

But Opal's time on Earth is almost at an end. They have one final summer together. So why is Opal acting so strangely all of a sudden? Can Martha discover the secret she's hiding - and what will it mean for their friendship?

If you love Jacqueline Wilson, Cathy Cassidy or Liz Kessler, you'll love reading about Opal Moonbaby.