Just finished The Rook by Daniel o'Malley.
The tagline says 'MI5 for wizards' which was a turn off, as I was expecting a more 'Harry Potter for grown ups' cash-in.
The low expectations helped, as I greatly enjoyed it. Good modern fantasy which reminded me of China Mieville's Kraken, which isn't a bad thing.
Just finished this, i actually enjoyed it.
Its like Men in Black but based in London.