It’s 1944. D-day is imminent and top-secret code-words OVERLORD and NEPTUNE have appeared in a national newspaper, the latest in a series of words suspiciously connected to the top-secret landing the Allies are preparing. A national emergency, everything points to crossword compiler, teacher Carl Bookman. Even more incriminating is the fact that he is of German origin, with a brother working on breaking German codes at Bletchley Park. Sixty years later, crossword compiler John Fellowes is tirelessly continuing the work that his grandfather Carl started at the Bookman Bureau. Times are bleak as computers are challenging crossword setters’ livelihoods and the bureau faces closure. When John discovers his grandfather may have been a Nazi spy, he is devastated and sets out to clear his name. With the help of Amanda, the bored but enterprising accountant from downstairs and his colleagues Turner, a deeply embittered chess grandmaster and Overend, a hyper-intelligent bridge player, he attempts to find out the truth behind the crosswords. The employees of Bookman Bureau are a suitably unconventional bunch. A passion for puzzles and games is how they earn their living. When the owner of the business discovers a potential skeleton in the family closet, they can’t…