The Killings — J.A. Whiting

This story takes place during the fall of Olivia Miller's senior year of college. Arriving at a Halloween party with her friend Melissa, the young women discover a gruesome crime scene in the hosts' living room. As Olivia and her friends try to uncover clues that will lead to the serial killer, it seems that the murderer may be someone they know and their investigation into the cases may be putting their own lives in danger.