Last one they really unanimously loved was
www.goodreads.com/book/show/22443909-the-imaginary
Just read www.goodreads.com/book/show/11116349-an-elephant-in-the-garden?ac=1&from_search=1&from_nav=true and it didn't really grasp thier interest.
It's preferable there's pictures as my 9 year old has a bit of difficultly in reading so pictures help keep his interest - they aren't essential though.
All suggestions welcome