Supper was eaten in camp before dark and the cook fire then extinguished.
Grace was troubled about Tom, and, as the hours wore on, the thought that perhaps he might have come to some harm, grew upon her.

She got up about midnight, and, leaving her tent, sat down on a rock, chin in hands, more nervous than she remembered ever to have been before.
Hurried footsteps aroused her to instant alertness.
"Is that you, Hippy ?" called a low-pitched voice off to the right of her.

It was Nora Wingate's voice.

Grace had not known she was awake.
"Yes.

Wake the girls, but be quiet about it.