The End of Mythology
Deep within the dusty basement of a New York museum lies mythology's most infamous artifact, Pandora's Box.  When rogue art thief Charles Deckard is tasked with stealing the box, he accidentally opens it and releases mythological creatues we thought were fiction.
 
Now giant griffons rule the skies, ravenous werewolves stalk the streets, and Deckard is left branded with a signet that is the secret to man's salvation.  With the aid of a clandestine paramilitary force, he must fight to seal the door between reality and myth once more or face the fall of civilization, torn apart by the tooth and claw of legend.