Third and final in the 'Time-Travelling Cat' trilogy.
As with the two previous novels, there are two strands to this. In the contemporary part of the novel Topher is settling into a new life in Chichester, a city with ancient Roman links. He becomes fascinated by a tile from ancient Rome he sees in a museum which has a cat's footprint on it. (Factually accurate - it's in Reading Museum). But he's being bullied at school by a boy who used to live in the house that Topher's parents have bought.
In the time-slip element of the story, Topher meets up with Marcus, the son of Cassius the tilemaker, and he discovers that it is, in fact, the time-travelling cat's pawprint on the tile. Marcus's elder brother is a bully and it is he who steals the symbol of power of the Roman Army - the eagle. Marcus and Topher have to get it back . . . before Topher can return to his own time.