The War of the Flowers by Tad Williams

An honest to goodness fairy story no less with pixies and pookas to boot from someone who has become one of my favourite authors. The protagonist of this tale gets whisked away to Fairie to discover all is not right in that magical realm. Fairy society has taken a wrong turn it seems and the sylvan glades of legend have been replaced with dark satanic power stations. This is a very entertaining read with genuinely unpleasant baddies that you long to see get their come-uppance. I won't give away any spoilers except to point out that it is a fairy story - draw your own conclusions.