Series: Gaius Ruso #5
I'm not sure why, but I found this one more engaging than I remember the other books in the series being. Of course, it still seemed to go on a while and some of the events seemed a bit ridiculous, but it was still mostly fun.
Ruso and Tilla found themselves back in Britain and Ruso is back in the army. He finds himself investigating some funny goings-on with the native recruits and Tilla gets involved, naturally.