The Conference of the Birds — Ransom Riggs

With his dying words, H -- Jacob Portman's final connection to his grandfather Abe's secret life entrusts Jacob with a mission: Deliver newly con­tacted peculiar Noor Pradesh to an operative known only as V. Noor is being hunted. She is the subject of an ancient prophecy, one that foretells a looming apocalypse. Save Noor -- Save the future of all peculiardom.

With only a few bewildering clues to follow, Jacob must figure out how to find V, the most enigmatic, and most powerful, of Abe's former associates. But V is in hiding and she never, ever, wants to be found.