Outside the Shire, Gandalf encounters Radagast the Brown, another wizard, who brings the news that the Nazgûl have ridden forth out of Mordor—and a request from Saruman that Gandalf come to Isengard. Gandalf leaves a letter to Frodo (urging his immediate departure) with Barliman Butterbur at an inn in Bree, and heads towards Isengard. There Saruman reveals his true intentions, urging Gandalf to help him obtain the Ring for his own use. Gandalf refuses, and Saruman imprisons him at the top of his tower. Eventually Gandalf is rescued by Gwaihir the Eagle.