A Talent for War is the first Alex Benedict book. I read that years ago and barely remember what all it was about. I think I am going to have to reread it. Polaris is the second. I'm glad you like it. It's a little spooky, or at least he tries to make it a bit spooky. It isn't necessary to read the series in order. Each adventure is a pretty much a stand alone, with minor references here and there about previous adventures.
BTW, while Polaris and Seeker are written as if Alex's assistant, Chase Kolpath, is telling the story, A Talent for War is written as if Alex is telling the story. I should be hearing from the library in a day or two to pick up the next one, The Devil's Eye.