Topher and his father are trying to get over the death of Topher's mother, an Egyptologist, when they take in a stray cat. This cat bears an uncanny resemblance to a cat ornament given to Topher by his mother and so they name it 'Ka', meaning 'double'. Topher becomes very attached to Ka and is puzzled by her mysterious absences.
Ka, the time-travelling cat, has disappeared, leaving just one clue. Topher soon realises that she has gone back to Elizabethan England, and he fears that Ka is in terrible danger. Cats were tortured in Tudor England, so Topher must try to find her before it is too late. In doing so, he meets Queen Elizabeth and Doctor Dee, the court magician and astronomer, who thinks Ka can help him find the elusive Philosopher's Stone.
Ka, the time-travelling cat, has vanished again, leaving Topher a clue in the form of a Roman word on his computer: Ca;;LLevA.
At first Topher isn't worried. Surely she's safe among the cat-loving Romans? But when he follows her to Roman Britain, they're both soon swept up in a conflict. As oppressed Britons fight the Romans, Topher faces a desperate choice - to help his British brother or his Roman friend?
Topher is planning a trip to London to visit his friend Ellie - but there have been bomb threats, which makes him worry.
What's more, his beloved cat, Ka, has going travelling again. Topher doesn't want to lose her. And sure enough, in the middle of a big bomb alert, Topher is called away - to a Saxon village threatened by Norsemen. Now he must get the villagers to heed his warning and foil the aggressors led by the terrifying Viking, Ingwar the Boneless, infamous for his cruelty and devious tricks. Can Topher save the village in time?
Great Victorian Stink
Topher's amazing 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 stinking sewage!
There he discovers a plot to kill Joseph Bazalgette, the man who is trying to save the city. Determined to foil this foul plan, Topher must first escape from an arch-criminal and his den of thieves.
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