While Hugh 'Bulldog' Drummond is staying in an old cottage for a peaceful few days duck-shooting, he is disturbed one night by the sound of men shouting, followed by a large stone that comes crashing through the window. When he goes outside to investigate, he finds a patch of blood in the road, and is questioned by two men who tell him that they are chasing a lunatic who has escaped from the nearby asylum. Drummond plays dumb, but is determined to investigate in his inimitable style when he discovers a cryptic message.
Sapper' is the pen name of Herman Cyril McNeile, born in 1888 at the Naval Prison in Bodmin, Cornwall, where his father was Governor. He served in the Royal Engineers (popularly known as 'sappers') from 1907-19, being awarded the Military Cross during World War 1. McNeile started writing in France, adopting the pen name because serving officers were not allowed to write under their own names. When his first stories, about life in the trenches, were published in 1915 they were an enormous success. But it was his first thriller, 'Bulldog Drummond' (1920) that launched him as one of the most popular novelists of his generation. It had several amazingly successful sequels, including 'The Black Gang', 'The Third Round' and 'The Final Count'. Another great success was 'Jim Maitland', featuring a footloose English sahib in foreign lands. Sapper published nearly thirty books in total, and a vast public mourned his death in 1937, at the early age of forty-eight. There are several feature films of his work.