"Dave Darrin and the German U-Boats or A Purge of Wary Sea Monsters" is an exciting adventure from H. Irving Hancock, which tells the story of the young hero Dave Darrin, who finds himself in the middle of a dangerous battle with German U-boats during the First World War. Brave Dave and his crew try to stop the threat posed by the submarines of the enemy navy, turning the fight into this exciting story. The book, full of inspiration and adventure, will not leave indifferent any lover of military literature.