Signal in the Dark by Mildred A. Wirt (Penny Parker #14)

SIGNAL IN THE DARK is #14 in the Penny Parker Series by Mildred Wirt Benson.

The Riverview Star is short-handed, and Penny convinces Mr. Parker to hire her during her school vacation. Penny finds the work difficult, especially because a jealous reporter makes trouble for her. Penny is asked to cover an explosion at the Conway Steel Plant and bungles the job when she loses the camera that was used to take pictures for the story.