In this volume of adventure the author depicts the lives of certain humble modern heroes whose unconscious courage ordinarily goes unnoticed. Mr. Moffett has chosen unusual and picturesque careers, and has offered dramatic scenes from the lives of the steeple climber, the diver, the balloonist,the pilot, the bridge builder, the fireman, the aerial acrobat, the wild animal trainer, the dynamite worker and lastly the locomotive driver.