What do the leaders of the Gladers do upon the arrival of the girl in Chapter Nine

Alby orders them to place her in the room next to Ben’s. He warns the other boys that if one of them even touches her that boy will spend the night in the Maze with the Grievers. Thomas is impressed to hear this. It is the first thing Alby has ever said that he was glad to hear.

As the girl is taken away by the Med-jacks, Thomas is sure that she and he are connected somehow. He is sure he must become a Runner, but isn’t sure why. Alby and Newt ask Thomas about the girl again. He states again that he does not know her, but Alby and Newt are suspicious, as are the other boys. Alby tells Newt to call a Gathering. As they depart, Thomas asks Chuck what a Gathering is. Chuck tells him that a Gathering is a meeting held by the Keepers when something strange or terrible happens.