Meet Billie Upton Green and her VERY accidental diary - and don`t you DARE call her B.U.G! Billie has taken the new girl at school under her wing. She`ll teach her the important stuff - Biscuit Laws, Mrs Patterson and of course where to sneakily eat a Jaffa Cake. She might even get invited to the EVENT OF THE YEAR (Billie`s mums` are getting married). But then suspicion sets in. The new girl seems VERY close to Billie`s best friend Layla. And she knows a LOT about the big school heist - the theft of Mrs Robinson`s purse. But, Billie is on to her. Well, as long as Patrick doesn`t catch her eating biscuits first. Join Billie in this laugh-out-loud adventure!