Ruth Fielding at the War Front

Ruth continues her work for the Red Cross and is soon transferred to a hospital that is on the war front. Ruth faces the very real danger of possible death but soon has a greater concern. Ruth asks a friend whether there is any news of Tom Cameron and learns that he has disappeared in Germany-and is suspected of working for the Germans! Ruth is shaken but certain that Tom would never betray his country... (Excerpt from Goodreads)