With an old Roman coin deep in his pocket: Mark is dreading PE at school. It's not that he doesn't enjoy sports, but that, well, he's not very good at them, and, he hates the way the other children laugh at him. Even Mr Duffy, the class teacher sometimes loses patience with him. Luckily, the Roman coin appears to hold a kind of magic, whenever Mark grips the coin and wishes he was somewhere different, he is strangely transported back to Roman England...