Dark Voyage by Alan Furst (Book 8 of 12)

“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,…

“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 . . .”

This post contains Affiliate Links. As an Amazon Associate, I earn from qualifying Purchases