"People's Republic" by Robert Muchamore

"Twelve-year-old Ryan is CHERUB's newest recruit. He's got his first mission: infiltrating the billion-dollar Aramov criminal empire. But he's got got no idea that this routine job will lead him into an explosive adventure involving drug smugglers, illegal immigrants and human trafficking, or that his first mission will turn into one of the biggest in CHERUB's history." 

"People's Republic" by Robert Muchamore is the first book in the second series of the CHERUB books.

It is a book where Ryan Sharma (the main character) and his friends are spies for CHERUB, which is a brand of the British Secret Service. Ryan i to go on a top-secret mission with the TFU, which a former CHERUB agent works for.

They are trying to bring down a billion-dollar criminal empire... Read the book to find out more!