My standard spoiler warning for this series: Antiagon Fire is the seventh novel in L.E. Modesitt, Jr.’s Imager Portfolio series, and the fourth one following the adventures of Quaeryt Rytersyn. The first three novels in the series had a different protagonist and were set in the same fictional world but several centuries after the events portrayed in the Quaeryt novels.
In other words, you may want to stop reading this review if you haven’t at least read the first three Quaeryt novels: Scholar, Princeps and Imager’s Battalion. If you’d like a refresher, you can find my reviews of those novels here, here and here. (You can also find my look at the initial Imager trilogy here.)
So, in summary: if you’re not familiar with this series yet, please check it out because it’s excellent—but stop reading this review here to avoid spoilers.