"Beware the unanswered riddle."
I just started Harpist in the Wind, book #3 of Patricia A. McKillip's Riddle-Master Trilogy.
Who is the Star-Bearer, and what will he loose that is bound? What will one star call out of silence, one star out of darkness, and one star out of death? War has come, born of riddles and wizards and shape-changers out of the sea, the hope of victory lying in the answers, three stars, and the efforts of Morgon and Raederle and their friends. And the truth about a certain harpist.
"Beware another riddle-master."