Twirltongue first appeared in Book 4 with two of her friends, they were under the city with Gregor, knowing that Ripred taught Gregor echolocation in that spot, and that Ripred wouldn't appear. This is where she nearly convinced Gregor that Ripred was the enemy, however, Gregor managed to realize she was lying and was nearly killed by Twirltongue's friends, but he managed to escape in the nick of time.