Related Clues:

• Novel by Robert Harris
• It's a mystery to me, as it's under your nose!
• Street guide not needed in new magazine puzzle
• German military cipher machine
• Game in wild is a mystery to me
• Hard puzzle
• 'The Imitation Game' machine
• Puzzle formulated in game
• Baffling mystery
• Imagine missing one cracking puzzle
• Puzzle in game worked out
• After midnight drink and drug, turned to puzzle
• Puzzle's new meaning missing at core
• Nazi cipher machine broken by the Allies
• Brain twister