The Midnight Palace - Carlos Ruiz Zafón
I flew through this book,( originally a YA work, I believe) and thoroughly enjoyed a 'ripping yarn' of gothic mystery and suspense set in Calcutta, India.
Twin babies are rescued from a pursuer bent on killing them; one is deposited in an orphanage , the other with its grandmother, where they remain until they turn 16,when their nemesis returns to seek them once more .
Throw in an abandoned railway station, ghost train ,and bunch of friends intent on discovering the mystery, and you have a good read for grown ups too.