On July 2, we will discuss Medicus: A Novel of the Roman Empire by Ruth Downie, a mystery set in Roman Britain during the time of the transition from Trajan to Hadrian. The hero of the novel is a much tried army doctor, stationed at the end of the world
My review of the novel.
An NPR interview with the author.
As to background on Roman Britain, Wikipedia has an extensive page with lots of good information.
Enjoy the read.