Don't Go To Work The World Is Ending

In 1666, a dragon attacked London and vanished, leaving chaos in its wake. Now, physics teacher Jack unwittingly stumbles into a hidden world of ghosts, gods, and witches after pocketing a dragon scale. Joined by Muriel, a witch, and her artist girlfriend, Nisha, they must stop a gangster's plan to wield the dragon's power-before it awakens