Girls of the Forest by L.T. Meade

When Pauline went up to her room late that evening she gave Verena a very cold good-night. Her little fire was still burning, for nurse had taken care of it. Verena heard her lock the door. Had she not done so her sister would have gone to her, and begged and prayed, as such a sweet girl might, for the confidence of Pauline. Verena had to get into bed feeling lonely and unhappy. Just as she was doing so she heard a firm step walking down the corridor. A hand turned the handle of Pauline's door, and Verena heard Pen's voice say:

"It's me, Paulie. It's me. Let me in, Paulie."