Recommendations please?

I have discovered a forgotten birthday present from my parents-in-law, which is a voucher for downloads from Amazon.co.uk.  Hurray!  Also, I'm going off to an internet-free, bookshop-free long weekend spent in a field, and after driving to and from France last week I've read all the books on my ebook reader.

These are two things that were made to be together   So I need recommendations of books to read.  Preferably ones from Amazon.co.uk and preferably ones which I can download immediately...