Fashion Victim (Sweet Valley High #131) by Kate William, Francine Pascal

Fired! Elizabeth Wakefield has been booted from her magazine internship—for stealing an idea she thought up in the first place! With the help of her twin sister, Elizabeth sets out to prove she was framed. Her snooping leads her into terrible danger when the glittering world of fashion publishing takes a dark and nasty turn.

Jessica Wakefield is in a major quandary. Dating fashion photographer Quentin Berg has been an exciting whirlwind of glamorous late-night parties. He knows all the right people. But Quentin isn't all he's cracked up to be—in fact, he's a shallow, stuck-up creep. It's Cameron Smith—a guy from the magazine's mailroom—who's got real class. Do nice guys really finish last?