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This has got to be my favorite Fantasy book. The journey is long, but, oh, so worth it!
Songs of Earth & Power - Greg Bear
The Song of Power opened the gateway to the Realm of the Sidhe, allowing young Michael Perrin to slip through. Now Michael faces years of captivity and deadly struggles for the future of the Realm and of Earth--leading finally to a terrible confrontation on the streets of Los Angeles, with the soul of humanity at stake.