London: Collins, (1938). First edition. Hardcover. Very Good / Very Good. Original burgundy cloth, lettered in silver to the spine. In a very nice example of the scarce dust jacket. The jacket shows some loss at the head of the spine and a triangular closed tear at the bottom of the front panel. Some very minor foxing spots at the top of the title page and again to the fore-edge. The top edge is soiled. For some reason this book has become extremely scarce and even more so with the dust jacket. An exciting naval story of a small group of civilians who come across a Nazi plan to mine English waterways. Intense Naval Military action. A mystery novel, and Espionage novel, and a World War II novel.