As you leave Moonstone Keep on your way to The Moonsong Temple, you are stopped by a group of Fallcrest guards that includes the Captain that you dined with that evening. They challenge you and try to turn you back to your Inn.
A battle ensues, you kill all but one guard and manage to capture 4 horses.
Interrogating one of the guards, you discover that the town guard and many other key locations in town have been infiltrated by cultists of the Elder Elemental Eye. It seems that their mission is to stop you from continuing to gather the rings of power.