Thirteen-year-old Tamsin has never had a boyfriend, and she's starting to feel left behind. Even her ten-year-old sister has a boyfriend, so surely it must be her turn soon! When Tamsin meets Alex, she just can't stop thinking about him, and she’s thrilled when he asks her out on a date. But he’s sixteen and has already left school. Before she knows it, Tamsin is lying about her age and going behind her parents back… but for how long can she keep up the pretence?