First Look: The BAU Seeks A Serial Killer's Help On 'Devil's Backbone'

'Devil's Backbone'

'Devil's Backbone'

When guards at a Virginia prison intercept a package with evidence relating to the kidnapping of two boys several years ago, the BAU questions a notorious serial killer who may have information on the boys’ whereabouts, on Criminal Minds, "Devil’s Backbone," on Wednesday, April 20, 9/8c on CBS.
The BAU seeks information from a notorious inmate.

The BAU seeks information from a notorious inmate.

"Devil's Backbone" (Episode 21, Season 11 of Criminal Minds)
Reid tries to get some answers.

Reid tries to get some answers.

"Devil's Backbone" (Episode 21, Season 11 of Criminal Minds)
The prisoner doesn't easily comply.

The prisoner doesn't easily comply.

"Devil's Backbone" (Episode 21, Season 11 of Criminal Minds)
The team tries to decode a letter.

The team tries to decode a letter.

"Devil's Backbone" (Episode 21, Season 11 of Criminal Minds)
Hotch analyzes the evidence.

Hotch analyzes the evidence.

"Devil's Backbone" (Episode 21, Season 11 of Criminal Minds)
The team notices a trend.

The team notices a trend.

"Devil's Backbone" (Episode 21, Season 11 of Criminal Minds)
The BAU is one step closer to locating the UnSub.

The BAU is one step closer to locating the UnSub.

"Devil's Backbone" (Episode 21, Season 11 of Criminal Minds)
Hotch delves deeper into the case.

Hotch delves deeper into the case.

"Devil's Backbone" (Episode 21, Season 11 of Criminal Minds)
The prisoner voices her demands.

The prisoner voices her demands.

"Devil's Backbone" (Episode 21, Season 11 of Criminal Minds)
Garcia and the team track the killer's whereabouts.

Garcia and the team track the killer's whereabouts.

"Devil's Backbone" (Episode 21, Season 11 of Criminal Minds)
The BAU depends on the prisoner's information.

The BAU depends on the prisoner's information.

"Devil's Backbone" (Episode 21, Season 11 of Criminal Minds)