Deadly Messenger centers around an FBI agent in pursuit of a serial killer known to stalk and attack women he meets while chatting on the Internet. Special Agent John Logan has been on the appropriately dubbed Cyber-Slasher case for almost seven years. Always seeming to be one step behind the killer, he's yet to make a substantial break and his superiors are threatening to pull him from the case. Although the killer's method of operation varies from case to case, two keys link them all--the use of a rare anesthetic, Phenyltetrizine, and the victim's intimate association with a mysterious stranger on the Internet. Can Logan catch the killer before someone close to him becomes the next victim?