It's the end of the school year and the prom is fast approaching. Gemma's friends all have dates and Gemma is destined to go alone. Gemma convinces herself that she doesn't care - it's great being single and free to mingle. But there's one boy who she secretly wishes would ask her - Sam. But Sam's dating Cindy - isn't he?
Meanwhile, when Gemma is asked to assist the school webzine's editor, Cindy, to review a top fashion show, Gemma somehow finds herself on the catwalk modelling for one of the nation's most talked-about designers. But strutting her stuff on the catwalk isn't exactly a breeze!
When the school invite Gemma's alter ego, astrologist "Jessica Jupiter", to be a guest speaker at the End of Year Assembly, Gemma has no choice but to agree. But Jessica's horrescopes have played cupid for half the school - if they discover she's not real then everything will be shattered. How will she dupe the entire school into believeing that Jessica Jupiter is for real?