Hit or Myth - Robert Asprin

Skeeve, the Court Magician to Possiltum is ordered to impersonate King Roderick for a day. One of his duties is to marry Roderick's fiance, Queen Hemlock, who possesses the sort of face and figure that features in the "before" bit in adverts. Her habits, too, fall into the category of homicidal.
 
In good condition with  yellowing pages.