“Debts,” he sighed, “that haunt them till they die.”
Doris came on deck. “You just can’t sleep on such a night!” she sighed. “It’s too wonderful—the river, the moonlight, and the dark, mysterious jungle at night.”
“And the spies,” Johnny added. “Don’t forget them!”
“The—the spies?” She stared at him.
He told her of his adventure with Mildred, and, of the mysterious night singers.
“They vanished,” he ended. “Vanished into thin air. And they had a boat of some sort. We saw its mark in the sand.”
“How thrilling! How sort of spooky!” she murmured.
“And there’s the code of the green arrow,” Johnny added. “We solved that—or rather Mildred did.” He explained it to her.
“That sounds dangerous.” She seemed a little startled. “But it—it doesn’t affect us, does it?”
“No—oo—not directly,” he responded. “But they are spies, all right! Their message shows that. You can’t have counter-spies without first having spies. If they should chance to think that we are the counter-spies, and that we’re watching them from the steel ball, and—”