Without another word the Little Captain turned and, with Mollie at her side, made off in the direction the boys had taken. Amy and Grace, arms entwined about each other, followed a little lingeringly in the rear of their bolder companions.
They had not gone far, when they heard the welcome sound of masculine voices in excited altercation, and the heavy tramp of feet coming toward them.
"Oh," sighed Betty, her lip quivering, now that the need of courage had passed, "they never sounded so good to me before."
"Thank heaven you're safe," cried Allen, while relief banished the fear in his eyes. "I don't know what we could have been thinking of, to leave you all alone—"
"But did you get him?" cried Mollie impatiently.
"No, worse luck," responded Will disgustedly, while the guard mopped his perspiring forehead. "That spy was a slippery customer. We did get something out of it, though."
"What?" they cried eagerly.
"This," said Will, holding up something that gleamed white in the moonlight. "It's a letter, and it ought to tell us a number of things we want to know about Mr. Adolph Hensler."
"Oh, is that his name?" cried Betty eagerly. "That tells us a good deal without even opening the letter."
"It's German enough," agreed Will. "But, gee! I'm sorry we didn't catch the fellow. The government needs him."