The Druon needs a little explanation. (The BtVS, on the other hand, needs no explanation.) This is an historical novel, telling the tale of the French kings of the 13th Century. It is not the kind of book we would normally buy, and is in fact a free gift from SFX, on its 18th anniversary, rewarding us for having been subscribers from day 1.
18 years of SFX magazine
Why is SFX giving away an historical novel? Well, possibly because of the cover quote: