Seated on the table, little Isobel looked up into Billy’s face and laughed, and when the laugh ended in a half wail Billy found that his fingers had tightened on her little shoulder until they hurt. He tousled her hair to bring back her good-humor, and put her on the floor. Then he went back to the partly open door. It was quiet in the darkened room. He listened for a breath or a sob, and could hear neither. A curtain was drawn over the one window, and he could but indistinctly make out the darker shadow where Isobel lay on the bed. His heart beat faster as he softly called Isobel’s name. There was no answer. He looked back. Little Isobel had found something on the floor and was amusing herself with it. Again he called the mother, and still there was no answer. He was filled with a sort of horror. He wanted to go over to the dark shadow and assure himself that she was breathing, but a hand seemed to thrust him back. And then, piercing him like a knife, there came again those low, moaning words of accusation:

“It was you— it was you— it was you—”

In that voice, low and moaning as it was, he recognized some of Pelliter’s madness. It was the fever. He fell back a step and drew a hand across his forehead. It was damp, clammy with a cold perspiration. He felt a burning pain where he had been struck, and a momentary dizziness made him stagger. Then, with a tremendous effort, he threw himself together and turned to the little girl. As he carried her out through the door into the fresh air Isobel’s feverish words still followed him:

“It was you— you— you— you!”

The cold air did him good, and he hurried toward the tent with baby Isobel. As he deposited her among the blankets and bearskins the hopelessness of his position impressed itself swiftly upon him. The child could not remain in the cabin, and yet she would not be immune from danger in the tent, for he would have to spend a part of his time with her. He shuddered as he thought of what it might mean. For himself he had no fear of the dread disease that had stricken Isobel. He had run the risk of contagion several times before and had remained unscathed, but his soul trembled with fear as he looked into little Isobel’s bright blue eyes and tenderly caressed the soft curls about her face, If Couchée and his wife had only taken her! At thought of them he sprang suddenly to his feet.

“Looky, little one, you’ve got to stay here!” he commanded. “Understand? I’m going to pin down the tent-flap, and you mustn’t cry. If I don’t get that damned half-breed, dead or alive, my name ain’t Billy MacVeigh.”

He fastened the tent-flap so that Isobel could not escape, and left her alone, quiet and wondering. Loneliness was not new to her. Solitude did not frighten her; and, listening with his ear close to the canvas, Billy soon heard her playing with the armful of things he had scattered about her. He hurried to the dogs and harnessed them to the sledge. Couchée and his wife did not have over half an hour the start of him— three-quarters at the most. He would run the race of his life for an hour or two, overtake them, and bring them back at the point of his revolver. If there had to be a fight he would fight.

Where the trail struck into the forest he hesitated, wondering if he would not make better speed by leaving the team and sledge behind. The excited actions of the dogs decided him. They were sniffing at the scent left in the snow by the rival huskies, and were waiting eagerly for the command to pursue. Billy snapped his whip over their heads.

“You want a fight, do you, boys?” he cried. “So do I. Get on with you! M’hoosh! M’hoosh!”

Billy dropped upon his knees on the sledge as the dogs leaped ahead. They needed no guidance, but followed swiftly in Couchée’s trail. Five minutes later they broke into thin timber, and then came out into a narrow plain, dotted with stunted scrub, through which ran the Beaver. Here the snow was soft and drifted, and Billy ran behind, hanging to the tail-rope to keep the sledge from leaving him if the dogs should develop an unexpected spurt. He could see that Couchée was exerting every effort to place distance between himself and the plague-stricken cabin, and it suddenly struck Billy that something besides fear of le mort rouge was adding speed to his heels. It was evident that the half-breed was spurred on by the thought of the blow he had struck in the cabin. Possibly he believed that he was a murderer, and Billy smiled as he observed where Couchée had whipped his dogs at a run through the soft drifts. He brought his own team down to a walk, convinced that the half-breed had lost his head, and that he would bush himself and his dogs within a few miles. He was confident, now that he would overtake them somewhere on the plain.