“But who could have done it?”

“Where was the letter?”

“In the pocket of my fur stole: that has a most secure clasp-button, and I’m sure it wasn’t meddled with.”

“Patty!” cried Bumble, “you know that spy thing, who dressed up as a woman——”

“What!” exclaimed Farnsworth.

Eagerly Patty and Bumble together told the story of the missing chaperon and the masquerading pastry-cook.

Farnsworth looked very grave.

“A spy, undoubtedly,” he said; “in Herron’s employ.”

“Oh, not Lieutenant Herron! Why, he’s one of our own soldiers!”

“Forget it, Patty. And you, too, Helen. Never mention the subject to any human being. Much depends on that. I can trust you?”