When Frankie and his best friend Drew head back to the Middle Ages for one last trip with the Sonic Suitcase, they're in for some strange surprises. What kind of knight rides a pig into battle? Who's the mysterious stranger who turns up right when Frankie's in serious trouble? And what could possibly make Drew want to stay in the Middle Ages forever? Only one thing is certain: Frankie's last time-travel adventure will be one to remember ...