Missing Abby by Lee Weatherly

I really enjoy this book,i can keep on reading it again and again and never get bored of it,There is quite a lot of series e.g Breakfast at Sadies and Child X. Child X is also good but i prefer Missing Abby because it's the first book out of all the series and it's an EXCELLENT book :)

When 13-year-old Emma bumps into her old friend Abby on the bus one Saturday afternoon, she later realises that she was the last person to see Abby before her mysterious disappearance. Amidst the media frenzy and everyone's struggle to come to terms with the possibility of Abby's death.What will Emma do next?