Again she glanced at Mrs. Quelton. Was it imagination, or was there already a faint and indefinable change?
“No, that’s nonsense,” she thought. “There couldn’t be, so soon—although I don’t know how often he gives her that priceless tonic.”
Suddenly she wanted to laugh. She had a very vivid memory of Dr. Quelton tapping that bottle with his finger, and saying to Captain Grey that he had a preparation in there which would make his fortune, if he chose.
“It wouldn’t now,” she thought, struggling with suppressed laughter.
There was nothing in that bottle now but water. Just before dinner she had run up to the cupola, emptied its contents into the sink, and filled it from the tap.
The idea had come to her when she overheard the two men talking. It had seemed to her then a plain and obvious duty to destroy the drug that so horribly affected Mrs. Quelton. Fate had allowed her to see which bottle it was. Fate gave her an undisturbed half hour when the doctor and Captain Grey were out; and, to make her plan quite perfect, the liquid in the bottle was colorless and almost without odor.
She had thought it possible that the doctor would not notice the substitution until his unhappy wife had had at least a chance to return to a normal condition. Lexy had meant to wait and to watch, and, when the moment came, to speak to Mrs. Quelton. She had thought that she could warn the doctor’s wife, and implore her not to submit to that hideous domination.
She had scarcely thought of the risk to herself, and it had not occurred to her that there might be serious risk to Mrs. Quelton. She knew almost nothing about drugs and their effects. Her one idea had been to destroy the thing that was destroying Mrs. Quelton. Only now, when it was done, did she realize the mad audacity of her act. A man like Dr. Quelton couldn’t be tricked by such a childish device. He would know what had happened, and who had done it. Very likely he had plenty more of the drug somewhere else. If he hadn’t—
“He’d feel like killing me,” thought Lexy. “I suppose he could, easily enough. He must know all sorts of nice, quiet little ways for getting rid of obnoxious people. Perhaps there was something in my dinner to-night!”
She dared not think of such a possibility.