Books in the Time-Travelling Cat series

Topher's cat, Ka, has time-travelled again and left him yet another mysterious clue. Following his nose, Topher finds himself in Victorian London where disease is rife and the Thames is clogged with sewage! There he discovers a plot to kill Joseph Bazalgette, the man who is trying to save the city, and is determined to foil this foul plan.

Topher is planning a trip to London to visit his friend Ellie - but will it be safe, with all the terrorist threats? And sure enough, in the middle of a big bomb alert, Topher is called away - to a Saxon village threatened by Norsemen.