"A serial killer in Oklahoma City is beheading random women, leaving behind a message written in the victims' blood: "POST HOC ERGO PROPTER HOC." Four people — the head CSI, an intern, an FBI agent, and a forensic pathologist search for answers, only to find out the haunting truth. The intern, Emily Johannsson wants to be a cop someday. She has dreams of working for the FBI or the US Marshals or the Secret Service — or even the CIA.." book cover