The Book of Maps (Sacred Books, Vol. III)

It's been nearly a year, but Dex and Daphna are still not over what happened in Turkey. What they gained and what they lost there is almost too much to conceive. They've done their best to put the whole nightmare behind them, to start a new life with their new mother--but their dreams won't let them move on: dreams of falling into the void through that noxious wind; dreams of wings, millions of black wings, flapping in the dark; dreams of that awful, bone-chilling laughter. And now, the night before they were to officially open a new chapter in their lives, they find their fears are not only in their heads. They find that when they came back from those dreadful caves, something came with them.