Topher Hope is on the move again. When his devoted cat, Ka, leaves a computer message saying she has gone to
CA;;LLevA
he follows her to a Romano-British settlement in AD 79. Ka is happy among the cat-adoring conquerors and their central heating! Topher, now a British boy, apprenticed to a Roman mosaic maker, has mixed loyalties. When the eagle, symbol of Roman power, disappears from the forum, threatening the fragile peace, Topher begins a desperate search. Can he find it and save his Roman friend, Marcus, from the Druid's murderous sickle? In this adventure Topher needs all the amazing powers of the time-travelling cat.

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. One day when he is playing a computer game with an Egyptian theme, Ka jumps on the keys and spells out the name Bubastis, which was the centre of cat worship in Ancient Egypt. Could Ka really be leading a double life and what is she trying to tell Topher?

Topher's amazing cat, Ka, has time-travelled again; she has left him the clue:
CAppeLLis
Following 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

Ka, the time-travelling cat, has disappeared, leaving just one clue - a word on Topher's computer screen:
R*iche mou*nt

When Topher discovers that 'Richemount' meant 'Richmond' in Tudor times, 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.

An exciting and transporting fantasy, exploring both contemporary and ancient issues.

Topher is planning a trip to London to visit his friend Ellie - but will it be safe, with all the terrorist threats? It worries him, and so do the extended absences of his beloved cat, Ka. She is going travelling again, and 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.

Topher Hope is distraught when Ka, his devoted cat disappears, leaving a word on his computer:
TENOCHT*I*TLaN
Wasn't that the home of the blood thirsty Aztecs? Then she must be in dreadful danger. But when Topher travels back to the time of the Aztecs, he finds trouble from another source. The Aztecs think Ka is one of their gods, but El Sol, a piratical Spanish conquistador, thinks she is a witch.
Can Topher save Ka from El Sol, rescue Pima, a girl the Aztecs want to Sacrifice,and escape from the wondrous, floating city of Tenochtitlan before it is destroyed?