The annual joint school dance (aka the Snog Fest) is looming, and Chloe and her three best friends are determined not to repeat last year's disaster, which led to Year 9's top Mean Girl, Maggie, humiliating them online as a pack of sad losers. First they need to figure out just what's going with the utterly incomprehensible yet strangely attractive St Thomas's boys - and so the science of BoyWatching is born...