The campfire girls of Roselawn : $b or, A strange message from the air

"The Campfire Girls of Roselawn: Or, A Strange Message from the Air" by Margaret Penrose is a story that follows best friends Jessie Norwood and Amy Drew, who are amazed by the new radio technology. Their ordinary suburban lives take a turn when a mysterious voice, seemingly broadcast through the airwaves, reaches their ears. They investigate and stumble upon a girl in trouble, seemingly held against her will by two suspicious women. This chance encounter launches Jessie and Amy into a world of mystery and danger, where they use their courage and friendship to help a girl in need, while also discovering more about themselves along the way.