Mac Cracks the Code (Mac B., Kid Spy #4)

"The Queen of England calls on Mac B. once again! This time, Mac must crack a secret code that has been recovered from a double agent. A series of clues leads Mac to France, and then to Japan, where he comes face-to-face with his arch-nemesis, the KGB man... and the world headquarters of Nintendo! Is the KGB Man secretly behind all of this? And are Mac's video game skills good enough to facedown his enemy at the Video Game World Championships?"--Provided by publisher.