I need to build tension by contrasting Jennifer's community role with her dark secret. The VK angle allows for cyber elements—she could be sharing clues, taunting the police, or using social media to manipulate. Including a subplot where the protagonist is a tech-savvy investigator trying to trace her online activities could add depth. Maybe some red herrings and a twist where Jennifer's online persona is more complex than it seems, perhaps she's using the murders for a personal reason tied to her past.