“Eighty-one!” exclaimed Millie. “A gain of eighteen points in less than six days! Why, you crazy boy, why don’t you sell?”

“Because I expect it will go to ninety—to three figures, for that matter. Hartz’s corners are almost uniformly successful, I have heard.”

“You foolish boy! They may quietly unload at any moment.”

“I don’t think they will until the stock goes above ninety.”

“Why?” she asked with astonished eyes.

“I couldn’t explain to you, Millie, just why I believe so. I’ve been studying the ground. I’ve even found out several of the people Hartz has got in with him. Every one of them can write his check for a million, lose it, and not miss the loss.”

“Why, how could you get such inside information?”

“Simply by having something definite to start with—that was Hartz—and then by using my eyes, my ears, and my brains.”

“Jack, you are either a wonder, or——”

She didn’t complete the sentence.