Margaret Penrose 
Campfire Girls of Roselawn [PDF ebook] 
A Strange Message from the Air

The Campfire Girls of Roselawn is a charming children’s novel with a surprisingly modern message about the amazing feats girls can pull off if they set their minds to it. Out of school for the summer, chums Amy and Jessie become entranced with radios and spend most of their time fiddling with this new invention. When they hear a cry of distress over the wires, the pair become involved in a mystery. The Campfire Girls of Roselawn is a fun and fast read for young and old alike.