The Dragon and the Fair Maid of Kent — Gordon R. Dickson

Jim Eckert, the Dragon Knight, must now confront the three disasters that lie in wait for any visitor to the English Middle Ages: war, plague, and Plantagenets.

The plague is caused by a covert invasion of shape-changing goblins with plague-tipped spears that seek to take over the world. Meanwhile, Eckert's castle is invaded by Plantagenets: Edward III, his son Edward The Black Prince, and Joan, the Fair Maid of Kent.

Against the background of a full-scale human-versus-goblin war, these worthies move in a swirl of intrigue and dynastic tension. And, as usual, it's up to Jim Eckert, in all his scaly glory, to make sure good triumphs in the end!