CHERUB by Robert Muchamore
Henderson's Boys again, by Robert Muchamore
Kiki Strike series by Kirsten Miller
Click by Linda Sue Park
Broken Soup by Jenny Valentine
Harry Potter series by J.K Rowling (mega-duh!)
Missing Persons by M.E Rabb
Thieves Like Us by Stephen Cole
Little Brother by Corey Doctorow
13 Little Blue Envelopes by Maureen Johnson
Borderland by Rosanne Hawke
Gallagher Girls series by Ally Carter
Spy Girl series by Carol Hedges
Alex Rider series by Anthony Horowitz
Bad Kitty series by Michelle Jaffe