I like to write in all different genres. I just like a new challenge.

We had so much fun together as friends that I suggested we [with Kate DiCamillo] write a book together.

Our rule was that we [with Kate DiCamillo] would write everything together, literally every word.

I don't think we [with Kate DiCamillo] intended to write a book about friendship, I think we intended to write a book about two friends.