Alone in the office late on a Friday night Danny Rennell finds himself longing for something to take him out of his mundane life. You should always be careful what you wish for though. What started out as an investigation into a technical fault escalates rapidly deep below London when ghosts from the past begin to walk the abandoned tunnels. Why are they here and why are they so angry? With the help of fellow IT technician, Evie Burke, they must try to unearth the secrets that left more than thirteen million dead beneath London's streets. What caused the flood? Is there more to it than meets the eye? It's safe to say that Danny Rennell's life is about to get a lot more exciting than he could ever have imagined.