The Prisoner of Heaven by Carlos Ruiz Zafon. I've read his first two - Shadow of the Wind and Angel's Game. I'm still not sure what the whole thing is about but apparently he wants to write another in the series to make it four, so maybe then all will become clear. They 're about post Civil War Spain, books, mystery and intrigue and are very good.
The Prisoner of Heaven I notice has a little endorsement on the back by Stephen King no less: 'The real deal, a novel full of cheesy splendour and creaking trapdoors, a novel where even the subplots have subplots........one gorgeous read.'