Falcon Travis remains a mystery to this day.
'A fascinating book packed with hands-on projects for children to try out - and who isn't fascinated by spies, codes and secrets? ...this would be a brilliant book to use as a theme for a children's party' - Parents in Touch; 'This book may well be the only work of children's non-fiction to have been used in evidence at an espionage trial' - Bookbrunch; 'The moment [the book] arrived and I turned to the first page I was hit by a wave of nostalgia... you could do a lot worse than buy a copy for your reluctant reader son or daughter, although don't be too surprised when they start acting furtive, go through your clothes in search of disguises and add an extra potato to your weekly shopping list so that they can make invisible ink' - The Book Zone; 'A goldmine of secret tricks and disguises, the book contains messages in code throughout and is a must for any youngster who fancies trying out a spot of espionage' - Gransnet; 'Can inject an awful lot of excitement and intrigue into a rainy afternoon' - Playing by the Book; 'A fascinating book that will delight younger and older readers alike' - Bookbabblers; 'The perfect book for boys or girls who revel in puzzles, code-cracking and brain-taxing stuff... brilliant fun and Colin King's fantastic illustrations remind me why Usborne books have always been a cut above the rest when it comes to interesting content and fab subjects' - Read it Daddy; 'A great book full of good, clean, honest fun that will delight children and keep them entertained, both inside and out' - Book a Poet; 'The ideal book for children with enquiring minds and a hint of mischief!' - Creative Steps; 'This book places the focus very much on how much a child with a bit of imagination can do with a piece of paper and a furtive nod' - Armadillo; 'A feast of fun, facts and fiendish spycraft skulduggery!' - Lancashire Evening Post; 'This is one of THE books for budding spies. Jam packed with code machines, disguise tips and ideas for hidden hideyholes, this book explains it all' - Booka Uhu's Book Nook; 'Hours of pleasure for little spies everywhere' - Book Reviews for Mums