The Dragon, the Earl, and the Troll — Gordon R. Dickson

'Tis the season for treachery: The Earl of Somerset is throwing a lavish Christmas feast, a revel above all others to celebrate the holiday. But the Dark Powers have chosen this joyous time to launch a massive offensive. An army of land-hungry trolls has laid siege outside the Earl's fortress, while a nest of venomous traitors waits to hatch its deadly plan from the inside.

Now Sir James, the brave Dragon Knight, must fight a battle unlike any he has ever known--a battle no man, knight, or dragon can win. Not even if he is all three in one.