"Get this!" Red said. "I heard someone speaking German at 511 Chestnut. That's close to your house." Brady stood speechless. Gretchen lived at 511 Chestnut! Surely she wasn't a spy. He felt pulled in two directions. He owed Gretchen his life. But Red was his best friend. He tried to change the subject. "We need to learn more about Hallie," Brady said. "She won't salute the flag. Maybe her folks are enemy spies and won't let her salute." He and Red needed to check on Hallie -- and maybe on Gretchen too. Book jacket.