What's the Name of That Book??? discussion

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Pish Posh
SOLVED: Children's/YA
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SOLVED. about two girls , in which one of the girls was a theif while the other girl was rich and she always wore black sunglasses and a pearl necklace . The book starts with the black dress girl sitting in a restaurant [s]
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I dont really remember the name but -
The cover was Pink And Black , And i think there were skyscrapers on it . The book was about two girls , in which one of the girls was a theif while the other girl was rich and she always wore black sunglasses and a pearl necklace . The book starts with the black dress girl sitting in a restaurant where she meets the theif who actually steals her pearl necklace but returns it . And then they go to stop a bad guy ? The rich girl has a.huge house. The girls must be around 16 ?
I read this nook around 5 yrs ago . And now I want to recomend this book to one of my friends . I remember only these details .
I would really appreciate your help !
Thanks :)