(Paperback)

Topher is desperate to find his beloved cat Ka when she disappears, leaving a single clue on his computer: TENOCHT*I*TLaN. The people of the wondrous, floating city of Tenochtitlan believe Ka is one of their gods, but El Sol, a piratical Spanish conquistador, thinks she is a witch.

(Paperback)

Ka, the time-travelling cat, has vanished again, leaving Topher a clue in the form of a Roman word on his computer: Ca;;LLevA. 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

(Paperback)

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. 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.

(Paperback)

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'.

(Paperback)

Topher is planning a trip to London to visit his friend Ellie - but there have been bomb threats, which makes him worry. And sure enough, in the middle of a big bomb alert, Topher is called away - to a Saxon village threatened by Norsemen. Can Topher save the village in time

(Paperback)

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! Determined to foil this foul plan, Topher must first escape from an arch-criminal and his den of thieves.