Taking the Plunge — Helen Bailey

Electra's finally taking the plunge. After all, her friend Lucy did it in France, Sorrel thought she had but hadn't after all, and Claudia, who's done it loads of times, has bet Electra she won't. She will, though. She's going to go out with the first boy who asks her. But what if he turns out to be a frog and not a prince? She can be very shallow.