There is a legend that if the ravens at the Tower of London ever leave then Britain will fall, so when somebody steals the birds, the Queen calls for Mac B. to find the thief and retrieve them--a mission that takes him to Iceland, where he encounters secret submarines, hungry polar bears, and his arch-nemesis from the KGB.

To crack a secret code, Mac follows the clues to France and Japan where he must use his gaming skills and defeat his enemy, the KGB Man.

Mac B. is on another secret mission in this totally true kid spy adventure from New York Times bestselling author, Mac Barnett! The Queen of England calls on her trusty spy, Mac B., once again. This time, Mac must navigate secret tunnels beneath the Berlin Wall in order to retrieve cheat codes from a Soviet scientist. Floppy disk in hand, our hero finds himself trapped in East Germany, stuck between the wall and the Stasi. How will he escape? Well...

Summoned by the Queen of England to save the world once again, trusty kid spy Mac B. navigates secret tunnels beneath the Berlin Wall to retrieve cheat codes from an adversarial scientist only to find himself trapped in East Germany.