This book is excellent. It is the best book I have read in a very very long time. The narrator is a 10 year old boy, twin brother to the Finn of the book's title, and struggling with events around his brother's "going" (I won't say more to avoid spoilers). The book plays perfectly on the emotional struggle, offset by a rare and authentic 10 year old humour. The writer understands 10 year old boys, and really makes you believe that this book comes from the mind of a 10 year old. It is so well done, that you suddenly realise how badly all the other books do it.
On top of this it is just an excellent piece of writing. It deserves to be a classic. It deserves to be more widely read, and if it isn't it just shows how so much of what makes a book sell is how well it is marketed. I cannot recommend this book highly enough.
This is an easy read, although the book has hidden depths. It can be just an enjoyable story, or it can really make you think - but that is your choice. It works either way. It will rightly take its place amongst my all time favourites.