X Files YA #15 Haunted

Lauren Kyte was always a good employee, dedicated to her job and faithful to her employer. But ever since her boss's death, Lauren's been a different person. Someone--or something--is shadowing her, an unseen force that swiftly and brutally murders anyone who dares to cross her path. Could her boss's poltergeist be acting as her overprotective guardian? Or is Lauren herself a murderous mastermind? FBI agents Mulder and Scully need to uncover the secret that led to her boss's untimely death if they hope to stop the killing spree in Lauren's wake.