There's James Bond for adult readers, Charlie Higson's Young Bond series for teenagers and for younger than that (and probably aimed at girls given the colour of the covers) we now have Jane Blonde...
Jane Blonde: Sensational Spylet is the first in a soon to be four book series.
Synopsis from amazon.co.uk: Janey Brown feels like she is practically invisible. With her stick-thin legs, mousy brown hair and grey eyes, no one ever notices her. Then a crazy woman turns up at the school gates, claiming to be Janey's godmother. According to hip-hop-talking, larger-then-life 'G-Mamma', Janey Brown really is something special. She's Jane Blonde, Sensational Spylet and it's time for her first mission.Swapping her too-big school uniform for a silver spysuit, and her battered satchel for a set of amazing gadgets, Janey soon discovers that nothing in her life, or in her past, is as it seems. Her elusive Uncle Solomon happens to be the head of SPI (Solomon's Politicational Investigations) and the greatest spy the world has ever known. Recruited by the government to work on top-secret Project Crystal Clear, Solomon has made a scientific discovery that could change the world. But now he's gone missing. Can Jane Blonde get to him first? Or will The Sinerlesse, a rogue spying group with evil purposes (and a very nasty dog), hunt him down and take his secret?
Also available are Jane Blonde Spies Trouble and Jane Blonde: Twice the Spylet with no. 4, Jane Blonde: Spylet on Ice, out in October.
The website has a spying game, a screensaver download as well as the usual stuff about the author and her first three books.