There is not much time left for the obscured world that thrums along silently beneath the Commoners of London's feet. Strange, unexplainable happenings begin to occur up above in the Known, increasing in their severity and calling unwanted attention to the expanse of hidden magic that the Guild has sworn to protect the secrecy of for the last five millennia.

Malevolent magic is at work one average afternoon when Hannah Ellis, a perfectly ordinary girl in London proper, witnesses something not-so perfectly ordinary, and ends up meeting an extraordinary boy who can't seem to rid himself of her and a new-found bewildering anomaly that she suddenly possesses.

When something dear is stolen away from her by the very same dark magic threatening the Guild, and when she becomes an unexpected central target of an extremist gang of dark magic wielders known as the Syndicate, Hannah dives headlong into the depths of Brink--the heart of Vale that lies deep in the Unseen--a city in desperate need of help if it is to be spared from the evil powers at work within and against it.

Suddenly tasked with the impossible of saving both her friends and her Known World from a dangerous man who wants to choke power out of the innocent to procure total immortality, Hannah delves into a journey that threatens to end both worlds as she knows them should she dare to run out of precious time.