“Try it, Sis!” shouted Tom.  “You can do it!”

And already his sister, setting her teeth hard upon her lower lip, was backing and turning the motor car.  In twenty seconds they were dashing off upon the track over which they had so recently come—­ on the road down the valley with the flood following fast behind them.

CHAPTER X

 The Race

The two girls on the front seat of the flying automobile were not prepared for racing.  Of course, Ruth Fielding had no proper automobile outfit, and Helen had not expected such an emergency when she had started with her crippled brother for this afternoon run.  She had no goggles, nor any mask; but she had the presence of mind to raise the wind-shield.

Already they could have heard the steady roaring of the advancing flood had not the racing motor car drowned all other sounds.  There was, however, no need to look behind; they knew the wave was there and that it was sweeping down the valley of the Lumano with frightful velocity.

Indeed, they were not at all sure for those first few miles whether they were traveling as fast as the flood, or not.  Suppose the wave should reach and sweep away the bridge before they could cross the river?  The thought was in the mind of both Helen and Ruth, whether Tom, on the rear seat, considered it or not.  When they finally shot out of the woods and turned toward the toll-bridge, all glanced around.  From here the upper reaches of the Lumano were plainly revealed.  And extending clear across the valley was the foam-crested wave charging down upon the lowlands, but a number of miles away.

Here was the first house, too.  They saw a man and woman and several children out front, staring at the automobile as it raced down the road.  Perhaps they had been called from the house by the vibration of the bursting dam.

Tom sprang up in the car and pointed behind him, yelling: 

“The flood!  The flood!”

It is doubtful if they heard what he said; and they, too, were on a knoll and likely out of the reach of the water.  But the three in the automobile saw the whole family turn and run for the higher ground behind their house.  They understood the peril which menaced the whole valley.

In a flash the auto had turned the bend in the river road, and the occupants saw the toll-bridge and the peaceful hamlet of Culm Falls.  There was no stir there.  The toll-bridge keeper was not even out of his cottage, and the light and flimsy gates were down across the driveway at either end of the bridge.  The bend in the river hid the advancing wall of water.  Perhaps, too, it deadened the sound of the bursting dam and the roar of the waters.

There was another house at the bend.  Helen tooted the automobile horn as though it had gone crazy.  The raucous notes must of a certainty have awakened anybody but the Seven Sleepers.  But the three in the car saw no sign of life about the premises.  Helen had started to slow down; but Tom stopped her with a hand on her arm.