“Prisoners originally held in Canada?” Penny inquired.
“Yes, they’ve been aided by a ring of very clever spies.”
Penny was silent as she thought over the information. There were many questions she longed to ask.
“Jerry—” she began, but just then there came an interruption.
In the Army truck an officer had adjusted his earphones. His attitude as he listened was one of tense expectancy.
“Picking up any signals?” Jerry demanded.
The other man nodded. “Something’s coming in! Yes, it’s our friend, the Voice. In just a minute we should know exactly where the station is located.”
Jerry and the girls remained in the truck, eagerly awaiting a report from the efficient men who manned the radio direction finders.
“Okay, we’ve got it charted!” came the terse announcement a moment later.
“Where’s the station located?” Jerry demanded eagerly. “Let’s see the chart.”