A gripping Second World War thriller in the vein of Robert Harris. Spring, 1941: the armies of the Reich are masters of Europe, whilst Britain stands alone. Lieutenant Douglas Lindsay is an interrogator with naval intelligence, questioning captured U-Boat crews. He is convinced the Germans have broken British naval codes, but he's a lone voice, a damaged outsider, and no one will believe him, neither his superiors nor his lover. Lindsay decides to risk all in setting a trap for his prize captive - and nemesis - U-Boat Commander Jürgen Mohr, the man who sent his ship to its doom.