 When a young homeless girl named Emily Wonder is reported missing, Luke and Malc rush back to the slums of London to try to save her from the murderer-and from a giant tidal wave that threatens to destroy the city.Everton Kohter is awaiting execution for murder when Luke Harding is tipped off that he is innocent.Luke wants to reopen the case, but the Authorities want him to investigate a suspected Pairing Committee fraud instead.