Unknown (narrator or host)

What the lieutenant doesn't release to the public are photographs, sent with a biography, and taken by BTK, of himself.

BTK also begins sending dolls, symbols of his victims.

One is supposed to be Josephine Otero, the 11-year-old girl he hung from a pipe in 1974.

Another doll represents victim Nancy Fox, murdered in 1977.

Over the next three months, BTK continues to drop all sorts of packages, with chapters detailing his kills.

Each one, detectives hope, bringing them a bit closer to their killer.

Dana Gouge is a Wichita homicide detective.

On January 25, 2005, he is notified about a suspicious package.

Scrawled on the outside of the package is the phrase, BTK bomb.

Thinking it may be a joke, the employee has opened the package.

There are no explosives.

Detectives access the store's surveillance videotapes.

What detectives find is a parking lot surveillance tape recorded at 2.37 p.m.

on a Thursday afternoon.

On it, a black SUV approaches a pickup truck and appears to slow down.

Police blow up images of the Jeep, but are unable to ID a tag number.

Still, they believe this might very well be a car owned by BTK.

It is perhaps their best lead in almost three decades of trying.

As some members of the task force work the vehicle angle, others investigate the contents of the so-called BTK bomb package.

Landwehr is willing to live with his lie if it helps catch a serial killer.