The panel also included a children's author, a journalist, a bookseller and Newsround's very own Lizo Mzimba!
For the past two months they've all been reading nine books, and they've finally narrowed them down to a shortlist of four.
These are:
- Sorceress by Celia Rees
- Saffy's Angel by Hilary McKay
- Exodus by Julie Betagna
- Mortal Engines by Phillip Reeve
Saijal said that to be a good judge you need to be a complete book addict and be able to read really fast.
'Unpredictable and surprising'
She also said: "For me a good book should be unpredictable. It should be surprising right up until the last page."
But to find out which book is the overall winner is you'll have to wait until January!
Watch Saijal & Tim's report 
Chat about your fave reads!
