It kept in the shadow, and they could see no details, only a light mass that was slowly and steadily advancing apparently straight to where they were crouching beside the wall.

Fil was trembling like a leaf, Nora declared afterward that her hair stood on end, Ingred and Verity felt shivers run down their spines.

Nearer and nearer came the white figure.
Its approach was more than flesh and blood could stand.

With a wild shriek Fil dashed across the lawn, followed closely by Nora, Ingred, and Verity.
"Girls!" cried a clear and well-known voice.

"Girls! Stop! What are you doing here ?" There was no mistaking the tone of command of the head-mistress.