From the front of the book:
In the finale to the Restoring Splendor major quest, you are asked to investigate an earthmote hanging over the Sword Mountains. Although the mote itself poses no apparent risk, it might harbor dangers to Waterdeep. Great heroism will be needed to face and defeat your adversaries in the skies. An ancient threat has returned, and the fates of House Moonstar and all Waterdeep may hang in the balance. A Living Forgotten Realms adventure set in Waterdeep for characters levels 11-14. The previous adventures in this Major Quest are WATE2-1 Gilding a Noble and WATE2-2 Closing a Deal.