Sam and Bailey:

"Jack's moving around. His last murders were in the southwest."
"That we know of."
"Postmark on this is Detroit."
"I'll call the Detroit field office, let them know."
"Do you think my security has been breached?"
"Hard to tell. I'll try to backtrack the letter; have George do a complete search of the files. What do you want to do?"
"Find him, lock him away for the rest of his life, and dissect every corner of his twisted mind. Either that or crawl back out to the farm and hide."
"I'm surprised you didn't say kill him."
"Then we don't learn anything. And all this pain would have been for nothing."
"You okay?"
"I'll deal with Jack. But I'm getting worried about this case, Bailey."
"Good."
"Good?"
"You take trips into dark places, Sam. When you start getting scared, that's when I know we're getting somewhere."