A Bad Spell in Yurt by C, Dale Brittain
Paperback. Condition: Good+. 1991. Baen Books. 1st Edition, 1st Printing.
1st Book in the Wizard of Yurt series
Newly appointed Royal Wizard Daimbert, learning his king is under a fatal spell, must find out who in the castle has been practicing black magic--the young queen, her flighty aunt, the royal heir, or Daimbert's own predecessor.