Every week we are featuring one of the brilliant books in the running for the Guardian children's fiction prize. This week it's Small Change for Stuart by Lissa Evans, a funny adventure full of magic cliffhangers.

Julia Eccleshare, who is the chair of the prize, says of:

"Small Stuart embarks on an awfully big adventure in this quirky puzzle-solving novel. Uprooted from London by his kindly but distracted parents, Stuart finds himself with nothing to do in his seemingly lifeless new hometown. The only interest comes from the confusion caused by the identical triplets next door, and that just makes things worse. But a long-lost letter from a long-lost great uncle sets Stuart off unlocking one baffling puzzle after another. Each more curious than the one before, the far-fetched solutions they require bring the book to a very surprising conclusion."

Now's your chance to read the book, hear from the author, write a review - and enter our young critics' prize.

Read an extract from Small Change for Stuart

Read an interview with Lissa Evans

Review my book!

Watch Lissa Evans (and her dog!) tell you why you should read and review HER book

Got a question for Lissa about Small Change for Stuart?

Send it to us at childrens.books@guardian.co.uk and we'll put a selection to Andy and publish your questions and his replies here

Buy Small Change for Stuart at the Guardian bookshop at a discount

Write your review!

The Young Critics competition is for all young readers to share their views on any of the longlisted books. Anyone under 16 can enter by writing a review of no more than 200 words of one of the books longlisted for the prize. Individuals or school classes can enter and there are great prizes to be won.

You can find out more, and download the application form, here.

If you would like your review to appear on the website as part of the book club you just need to join the site (you can find out how here, it's really simple!) and then email it to us. It can be any length!

Two of the Guardian's top children's books critics, Philip Ardagh and Linda Buckley-Archer have given some great advice on writing book reviews. And, of course, it must all be your own work. If you decide to quote from anybody else's review, then you MUST credit them.

Or comment!

If you'd just like to share a quick comment about the book, email it to childrens.books@guardian.co.uk and we'll add it to this page

Find out more about the Guardian children's fiction prize bookclub

Next week's book: Momentum by Saci Lloyd