Isobel by James Oliver Curwood

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 -- "