She did not want to stop, but something in Barbara's voice indicated strain.

If Barbara were startled, it was strange.

Then, not far off, a branch cracked and the pine-spray rustled as if they were gently pushed aside.
"Oh!" Grace cried, "something is creeping through the bush!" "Then don't stop," said Barbara.

"Perhaps it's a wolf!" Grace clutched her dress and ran.

At first, she thought she heard Barbara behind, but she owned she had not her sister's pluck and fear gave her speed.