Just one important point before I start: this review contains no spoilers; Pratchett fans can read it with impunity.
'Nation' is one of Terry Pratchett's Young Adult books. It isn't set on Discworld, and the characters are new. It's set on our Round World, in Victorian days, at the height of the British Empire.
Well, to be accurate, it's set in an alternative world, in a different leg of the Trousers of Time, where, among other things, the Royal Family has met with a series of calamities, and it is vitally important that the Heir to the Throne be found (some small print in the ratified version of the Magna Carta, apparently).
The two main characters are teenagers - both, for various reasons, without a Nation, and both representing all that is best in their respective cultures. Mau, the boy, is the only survivor after his island is devastated by a tsunami. Ermintrude, the girl, is shipwrecked on his island.
No. It isn't The Blue Lagoon. That's all the plot that I'm willing to divulge.
Like all of Pratchett's work, this book can be interpreted at many levels. The younger folk will enjoy the yarn, which is brilliantly crafted, as always. They might even identify with the characters. Both show that curious mixture of wisdom, intelligence and basic Humanity of all of Pratchett's younger characters. There are many moments of tension, resolved at the narratively appropriate minute, plus an ending which brought tears to the Reviewer's eye.
Pratchett's sense of humour is never absent. A stunningly beautiful scene where all the multi-colored birds in a tropical island take wing at once, is brought to earth when he mentions the problems that occur when standing underneath a large, nervous, flock of birds.
And for us older readers? Many layers of allusion, discussion of deep questions about Belief, Monarchy, the Responsibility of Command, Gods, tree-climbing octopi, Reality, and the Lonesome Palm. I will freely confess that I love Pratchett's work, including his Young Adult books. Given that I'm older than Mr Pratchett himself, I can only conclude that I'm a young adult, for large values of 'Young'.
This is another marvellous book. Long may he continue to produce them.
If you've never tried his work - try this one; it comes with no baggage.