Time-travelling Cat and the Great Victorian Stink

Topher's amazing cat, Ka, has time-travelled again; she has left him the clue: CAppeLLis Following her, Topher finds himself in Victorian London. Topher discovers a plot to kill Joseph Bazalgette, the man who is trying to save the city. Determined to foil it, Topher must first escape from an arch-criminal and his den of thieves.