The sixth in the series about centurions Cato and Macro. Just as good as I remembered the earlier ones, good action and conspiracy here. I was pleased to find from the author's website that he has finished the next one, so I won't have to wait too long. I really wanted to just keep reading when this finished, though.
It doesn't help that he's setting up for a fairly long sage - the two heroes are steadily becoming trusted officers of Vespasian and enemies of Vitellius, meaning that the climax of the novel is likely to be the civil war in which the latter was briefly emperor and the former succeeding him in the end.