The GCHQ Puzzle Book IIThe brain busting follow up from the UK's finest code breakers and puzzle solvers at GCHQ, now available in a handy paperback GCHQ are back with a new collection of head scratching, mind boggling and brain bending puzzles that will leave readers pondering for hours. For those who found themselves occasionally stumped with the first book, there will be even more starter puzzles to get those brains warmed up. Puzzle aficionados, meanwhile, can test