'That Sarah,' you may well be saying to each other. 'Gallivanting off to Mexico, never a thought for her solemn promise to give away a book a month in 2009.'

But I always keep my promises, and here is my post about my October Book.

It is Liar by Justine Larbalestier.

Now, Liar is a hard book to talk about, because it is an important book not to spoil. I don't just mean it's important not to spoil the ending - spoiling the ending of any book is often considered a bad move. It's important not to...