From decoding top-secret messages to collecting gadgets and cracking safes, help spies complete all kinds of mysterious missions in this exciting book packed with over 100 puzzles. With mazes, wordsearches, spot the difference and more, there's plenty to keep young secret agents busy on journeys, rainy days and holidays.

Before joining Usborne, Simon worked in Moscow as sports editor for a local paper. These days he writes about things that aren't actually real, but are very important nevertheless. Mysteries and monsters and impossible quests in faraway realms that you won't find on any map. All the sort of stuff he loved as a child, basically. (And still does.)