“A John le Carré–style spy thriller with a difference—it’s all true! John Humphries lifts the lid on the enduring suspicion that Welsh nationalists spied for Germany during the Second World War. Hitler promised home rule if Wales helped the Nazis to win. A retired Swansea police inspector was recruited to sabotage the British war effort; a U-boat was sent to land explosives on a secluded beach; and three Cuban saboteurs arrived aboard a fishing boat. Spying for Hitler even has a twist in the end. Humphries, a former newspaper editor, has applied his undoubted journalistic skills to solving one of the outstanding mysteries of the last war, one that cast a dark shadow over a resurgent nationalist movement. A gripping read, meticulously pieced together from MI5 and German military intelligence sources.”

Terry Breverton