Sally Sharp and the Corduroy Clue

It's a dream job - a chance to model the fabulous outfits designed by Jones & Hewens for their new Corduroy Rose label.
For Sally, Tasha and Fay, it's a way to end the summer on a high note before school begins. And it doesn't hurt a bit that head designer Peter Hewens is stunningly handsome in a dark and brooding style.
But a shadow has marred the glamour. A guest was killed during one of the showings at wealthy homes, and a series of thefts may be linked to the murder.
And then Peter's young sister Valerie vanishes, leaving signs that convince the police of her guilt. Before she "ran away" she asked Sally Sharp for help, but never had a chance to say why she was afraid.
At 17, Sally is already well known as a problem-solver. Suspecting that Val was set up, she takes the case. It pits Sally, Tasha and Fay against the police, against Peter - who bafflingly refuses to cooperate - and against a pair of vengeful teens who mean to bring Sally to a permanent and very unglamorous end.