Shadows of the Dark Crystal

Shadows of the Dark Crystal is an upcoming novel set for release in June 2016. Written by J.M. Lee, it is the end result of the Author Quest contest the Jim Henson Company held in late 2014.

Summary
"Deep within the remote swamplands of Sog, a young Gelfling woman called Naia encounters a mysterious silver-haired traveler who brings life-altering news from the All-Maudra. No longer bound to remain in her small village, Naia embarks on a journey to the Castle of the Crystal—the home of the Skeksis overlords who have accused her twin brother of treason.""Unwilling to accept these accusations, Naia hopes to learn the truth about her brother. However, the truths that she uncovers reveal something far greater than the fate of one Gelfling or even of the whole Gelfling race.""Something dark is spreading throughout Thra, and there are those who will do whatever it takes to ensure that its true nature remains hidden."