Nightfeeder: The Chronicles of Galen Sword, Book 2

There is another world. It is the birthplace of all our nightmares. Vampires, werewolves, demons, deadly creatures that have no name or form ... they are all real. Galen Sword, born within that world was destined to be an adept warrior, heir to the Victor of the Greater Clan Pendragon. Yet as a child, his birthright and his memories were stolen from him, and he was exiled to a world without substance, without magic, without hope: Our world. But twenty years later, mysterious chain of events restores Galen's memory of who he is, and hints at what he might become. Now Galen will stop at nothing to find the truth-and his home. But with no powers of his own, his only tools are those of science. Galen and his team are caught up in the deadly politics of the First World as the Greater Clan Seyshen provokes a war between vampires and shapeshifters that's ready to explode into the streets of New York.