Fang by James Patterson

Fang will be the first to die. For years, Max has been on the run from evil forces threatening her and the Flock – but nothing could have prepared her for this horrifying prophesy delivered to her by Angel. Fang is Max’s best friend, her soulmate, her partner in leadership of her flock of winged children. A life without Fang is a life unimaginable. Max’s desperate desire to protect Fang brings the two closer than ever. But their world is turned upside down yet again when the Flock meet a wealthy scientist who has a great interest in the birdkids. He introduces them to another winged boy, the beautiful Dylan. Raised in a lab like the Flock, he exists for only one reason: he was created to be Max’s perfect other half. Now, a battle of science against soul, perfection versus passion unfolds, twists, and turns …and meanwhile, the apocalypse is coming.