Poltergeist

This second novel in the acclaimed Greywalker series finds PI Blaine Harper investigating a chilling case as Halloween approaches. After university researchers create an artificial poltergeist, the team leader suspects someone is faking the phenomena. When a student is murdered, Blaine is asked to investigate. Stepping into the spirit world, she realizes the haunting may be very real. But that doesn't necessarily mean a ghost did the killing.
"A good addition to fantasy and mystery collections …"—Library Journal