The Captive Celt (Terry Deary's Roman Tales)
Goodreads Rating: 3.88
Publisher: A. & C. Black
The books in this series contain funny stories based on historical events. Set in Rome in AD51, this is the story of Deri, a Celt who faces execution for criticizing Rome. Deri's cellmate is a British chief, and he believes there is a way to save both their skins.