This is a good yarn; get all three!
Wow! A real master tale weaving past, present, and future. Pay attention to the dates and everything falls in place beautifully.
Each alternate chapter takes place in 1369 DR Faerun time. The others consist of points in Corymrean history where the kingdom was at stake (as it is in "present" time). The book is a mystery of sorts, and while I generally don't like books that jump around in place or time (and honestly I got a little disillusioned with the flashback chapters toward the middle), as you get toward the end the history begins to contribute more and more to the plot, and you start to see the mystery unravel. I was pleasantly surprised at how much I enjoyed the read overall and I'd recommend it even if you're not reading to learn more about Cormyr's history (which it's also great for).
Cormyr has been ruled by the Obarskyr family since its inception one and a half millennia ago. Now its king, Azoun IV, lies on his deathbed, and the vultures are circling, hoping to usurp the throne for their own. Against this crisis of state, the history of the Forest Kingdom unfolds, relating the previously untold story of a nation, its rulers, and its wizards.