Hornet flight / by Ken Follett.

Enhanced descriptions from Syndetics:

Ken Follett--the master of suspense--follows his bestsellers Jackdawsand Code to Zerowith an extraordinary novel of the early days of World War II. It is June 1941 and the war is not going well for England. Somehow, the Germans are anticipating the RAF's flight paths, and shooting down British bombers with impunity. Hermia Mount, an intelligence analyst with MI6, wonders if the Germans could have perfected a radar system like the one the British themselves are struggling to achieve-but that notion itself is shot down, by her own bosses. Preposterous, she is told; stick with what she knows. But, still, she wonders. Across the North Sea, eighteen-year-old Harald Olufsen takes a shortcut across the German-occupied Danish island of Fano on his homemade motorcycle, and comes across an astonishing sight. He doesn't know what it is, but he knows he must tell someone. In Copenhagen, police detective and collaborator Peter Flemming searches his list of known troublemakers. The Germans are determined to discover who is smuggling information, and an idea has just come to him. This could even mean a promotion.... In the weeks to come, their lives and the lives of those close to them will intertwine, and for Harald in particular, it will be a time of trial. For when he finally learns the truth, it will all fall upon him to deliver the word to England-except that he has no way to get there. He has only an old derelict Hornet Moth biplane rusting away in the nave of a ruined church: a plane so decrepit that it is unlikely ever to get off the ground . . . even if Harald knew how to fly it. Filled with knife-edge suspense and rich, tantalizing characters, this is Ken Follett writing at the top of his form-unforgettable storytelling from an unforgettable writer.