Why is Rosie being singled out for preferential treatment by some of her teachers?
She is told it is her 'time' - but time for what?
Why has she suddenly developed strange 'powers' and where did they come from?
She is also being tested - but tested for what?
To add to this, a mysterious bug is affecting the school. Girls are getting fat and spotty at a alarmingly fast and displaying other symptoms.
Rosie puts it down to their bad diet and lack of exercise, but why has it come on so fast?
Together with her friends (and a little help from her mum) she goes about finding the cause of the mysterious sickness and hopefully, a cure.
Find out what this cure might be and remember - you are what you eat!