Tiger Burning Bright Hardcover – January 1, 1995 by Marion Zimmer Bradley (Author), Andre Norton (Author), Mercedes Lackey (Author)
 
Abdictating when their realm is threatened by an all-conquering emperor, the three ruling women of Merina secretly plan a powerful counterattack that takes the form of deception, misdirection, and magic. 20,000 first printing.
 
From Booklist
Three fantasy giants--the "others" are Andre Norton and Mercedes Lackey--join forces to produce this tale of three women who rule a city. A priestess grandmother, a reigning queen mother, and a warrior princess daughter must use all their skill and strength in both open and secret battle to defeat an evil emperor and his truly odious, not to mention potent, sorcerous henchman. None of the troika has ever told a bad story on her own, and they do not when collaborating. The only possible caveats are that the three writers blend so well that this is not the book to start an acquaintance with any one of them individually and that the plot is so stock that some may find it lacking in interest. Interest will not, however, be lacking in any book with these three mighty fantasists' names on the cover. Roland Green
 
4.5