Topher's amazing cat, Ka, has time-travelled again; she has left him the clue:CAppeLLisFollowing her, Topher finds himself in Victorian London where disease is rife and the Thames is clogged with stinking sewage!

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. This is the sixth adventure of the Time-Travelling Cat