Favourite book rn- A good girls guide to murder

A good girls guide to murder is about a young girl (17) who is determined to uncover the secrets of the Andie Bell case which was about a girl who mysteriously disappeared 5 years ago (is known to be killed by Salil Singh) and has not been found since, originally Pippa fitz Amobi (the fmc) does this for her EPQ but, it then becomes much more. 

BTW- this book is not similar to my book in any way except murder!