Now back as senior scientist in the Forensic Investigations Unit, Donovan doggedly pursues a serial killer who takes pretty blonde women as his victims. He thinks he knows not only the killer, but also the next target--Sharon Page, a pub owner looking for more from Donovan than merely protection.

The entire FIU team rushes to a secluded air force base, where a cargo plane has landed with all of its passengers and crew stricken by an unknown illness. Authorities believe it's biological terrorism.