SOLVED. Thriller about a female journalist who starts working in a school with three students and wants to kill her husband [s]

[Serena.. Sery-ously?]

Good evening!! Hope my english will be clear enough :)
I'm looking for a book I read in 2001/2002, even if the book seemed to me a little bit older (maybe from the 80/90's); it has a black cover with a woman and maybe it is written by a female writer (not 100% sure, although!).
The main character is a young and beautiful journalist that wants to make a reportage in a high school and three students agree to help her; one is a shy female, one is a not-so-good guy and the third is a guy too.. She plans to kill her husband with the help of the students..

I really thank you!! :)

[Amanda]

I remembered it because of the movie that was made based on it. To Die For

[Serena.. Sery-ously?]

Thank you so much, Amanda!! I was really hoping to read it againg, thank you!!

[Amanda]

No problem :) It was a great movie too.