There was no smoke to be seen.

She turned to go, then impelled by some mysterious influence, her eye traveled to the door of the small room at the left of the gymnasium.
With a cry of consternation she sped across the floor, flung open the door and staggered back, choked by a perfect volume of smoke that issued from within.

The interior of the room was in flames.
To think was to act.

Unless help arrived speedily their beloved gymnasium would soon be a thing of the past.

Grace tore through the corridor like a wild girl, and darted out the door and across the campus.