Fielding, you get your hat and coat and come with us."

"I don't know that I may," Ruth said, timidly.

"I'll believe that he is an ogre then, and that you are kept a prisoner in this awful castle," cried Helen.

"I'd love to go," murmured Ruth.

"Then run and ask," urged her friend, while Tom added, good-naturedly:

"Yes, why not come along? Don't be afraid of Nell's driving. She handles the car all right."

Ruth knew that Uncle Jabez had gone to town. She had a feeling that he did not like the Camerons and might oppose her friendliness with them. But he was not at hand now to interfere with her innocent pleasures. She went in and asked Aunt Alvirah if she could take the ride.

"Why not, child? You've been the very best helpmate ever an old woman had-- Oh, my back and oh, my bones! Run along and have your fun, deary. You need not be back till supper time. You have earned your little outing, that's sure and sartain."

Before Helen had picked her up on the road to the Red Mill that first day, Ruth had never ridden in a motor car. On that occasion they had traveled very slowly, while the girls talked. But now, when she was seated beside her new friend, Helen ran the auto on its high gear, and they shot away up the level river road at a pace that almost took Ruth's breath away,

"Up here among the foothills is the big Minturn Pond Dam," Tom said, leaning forward to speak to their guest. "It's twenty miles above your uncle's dam and is a deal bigger. And some say it is not safe-- Wait, Nell! Slow down so that we can see the face of the dam from the Overlook."

The speed of the car was immediately reduced under Helen's manipulation, and then she swerved it into a short side road running toward the river, and they came out upon a little graveled plaza in the center of a tiny park, which gave a splendid view of the valley in both directions.

But the young people in the motor car turned their eyes to the west. There the face of the Minturn dam could be discerned; and even as they looked at it they seemed to see it changing-- dissolving, covered with mist, and spouting geysers of what at first seemed like smoke. But it was Tom who realized the truth.

"She's burst!" he cried. "The old dam's burst! There she goes in a dozen places!"

Although they were several miles down the valley, the thunder of the bursting masonry now echoed in their ears. And up from the bottom of the wall, near its center, a great geyser spouted. In a moment the wall crumbled and they saw tons upon tons of the masonry melt away. The waters of the pond burst through in a solid flood and charged down the valley, spreading wider and wider as it charged on, and bearing upon its crest every light and unstable structure found in its path.

It was a startling-- a terrifying sight. No wonder the two girls cried out in alarm and clung together. The sight of the charging flood fascinated them.

But then they were aroused-- and that within the first half minute of their terror-- by Tom. He was trying, crippled as he was, to climb over into their seat.

"What are you doing, you foolish boy?" cried Helen. "Sit down."

"We've got to get out of here!" muttered the excited youth.

"Why, we are safe here. The water will never rise to this height."

"I know it! I know it!" groaned Tom, falling back in his seat and paling because of the pain from his arm, which he had twisted. "But don't you see? There are many down the valley who won't know of this until too late. Why, they can't see it at the bridge-- at Culm Falls-- until the flood is right upon them."

"It's true!" gasped Helen. "What shall we do?"

"We must warn them-- we can warn them, can't we?" demanded Ruth. "This car runs so fast-- you control it so well, Helen. Can't we warn them?"

"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.

"Not here! Not here!" he yelled. "Get across the river first, Nell! That wave is coming!"

Indeed it was. And the toll-bridge keeper did not appear, and the gates were shut. But Helen Cameron was excited now and her racing blood was up. She never hesitated at the frail barrier, but drove straight through it, smashing the gate to kindling wood, and smashing their own wind shield as well.

Out ran the toll-man then; but they were half way across the bridge; he could barely have raised the other gate had he set about it instantly. So they went through that, too, leaving him bawling and shrieking after them, but soon to learn by looking up the river what Tom meant by his excited words as the motor car swept by.

Helen slowed down at the smithy. There were several men there and a number of wagons. The trio in the car screamed at them: "The dam has burst! The flood is coming!" and then started up again and swept through the little village, looking back to see the group at the smithy running in all directions to give the alarm

Now the road, clear to the Red Mill and beyond, ran within sight of the river. The mill was all of ten miles away. The valley was low here and as far as they could see ahead it broadened considerably on this side of the Lumano. But the hills arose abruptly on the farther bank and all the force and mass of the flood must sweep across these meadows.

As the car moved on, Helen tooted the horn constantly. Its blasts alone should have warned people of what threatened, without Tom's frantic shouts and gesticulations. They were obliged, however, to slow down before several houses to make the occupants understand their danger.

They were not half way to the Red Mill when the roar of the advancing tidal wave was apparent even above the noise of the auto. Then they saw the crest of the flood appear around the bend and the already heavily burdened waters dashed themselves upon the toll-bridge. It crumpled up and disappeared like a spider-web bridge, and the flood rolled on, the wave widening and overflowing the lowlands behind the automobile.

Ahead of them now upon the road there was a single foot-passenger-- a man carrying a heavy basket. He seemed so far from the higher ground, and so determined to keep to the road, that Ruth cried out and laid her hand upon Helen's arm. The latter nodded and shut off the engine so that the automobile ran down and almost stopped by this pedestrian.

"Here, you!" shouted Tom, from the tonneau. "Get in here quick! There's no time to lose!"

Much of what he said was lost in the roaring of the waters; but the