A Geek Girl's Guide to Murder (Geek Girl Mysteries #1)
Julie Anne Lindsey

Mia doesn’t have time to hunt down a computer hacker. Her best friend has disappeared, and she finds another of her friends murdered—in her office. When the hunky new head of Horseshoe Falls security identifies Mia as the prime suspect, her anxiety level registers on the Richter scale.
Eager to clear her name, Mia moves into action to locate her missing buddy and find out who killed their friend. But her quick tongue gets her into trouble with more than the new head of security. When Mia begins receiving threats, the killer makes it clear that he's closer than she’d ever imagined.