…the English translation of the sequel, The Angel’s Game, comes out in June and is available for pre-order. I read it in Spanish some months back (the review here) and enjoyed it quite a bit (despite a precipitated ending).
It’s nowhere as good as Shadow of the Wind, but it’s fun and I will definitely read Zafón’s next book in the series. (This book isn’t a sequel to Shadow, but it has some overlapping characters.)