Dark Voyage Night Soldiers Series, Book 8.

"In the first nineteen months of European war, from September 1939 to March of 1941, the island nation of Britain and her allies lost, to U-boat, air, and sea attack, to mines and maritime disaster, one thousand five hundred and ninety-six merchant vessels. It was the job of the Intelligence Division of the Royal Navy to stop it, and so, on the last day of April 1941 . . ." May 1941. At four in the morning, a rust-streaked tramp freighter steams...