After he was banished from Edoras, it appears that Gríma Wormtongue went north of the road to Isengard. He is either avoiding the road, has business to attend to elsewhere, or both.
You have encountered Gríma Wormtongue on the plains just north of Edoras, and he appears to be travelling west towards Isengard with a host of Orc bodyguards. You should deal with the bodyguards and confront Gríma.
You have encountered Gríma Wormtongue on the plains just north of Edoras, and he appears to be travelling west towards Isengard with a host of Orc bodyguards. You should deal with the bodyguards and confront Gríma.
You have encountered Gríma Wormtongue on the plains just north of Edoras, and he appears to be travelling west towards Isengard with a host of Orc bodyguards. You should deal with the bodyguards and confront Gríma.
Gríma would like to have a word with you after you defeated his bodyguards.