Highlights from the Fifteenth Episode of Season 2 of Blue Bloods

1. Interview Room

2. Investigative Process

3. Dispair

When a Reagan family friend, an undercover detective, is killed, Linda and the boys worry about Danny, as his relentless search for the killer takes a toll on his emotional state, on BLUE BLOODS. Photo: JoJo Whilden©2012 CBS Broadcasting, Inc. All Rights Reserved.

4. Control Center

5. In The Dark

When a Reagan family friend, an undercover detective, is killed, Linda and the boys worry about Danny, as his relentless search for the killer takes a toll on his emotional state, on BLUE BLOODS. Photo: JoJo Whilden©2012 CBS Broadcasting, Inc. All Rights Reserved.

6. Worried

A Reagan family friend, is killed, and Linda (Amy Carlson) worries about Danny (Donnie Wahlberg) as his relentless search for the killer takes a toll on his emotional state, on BLUE BLOODS. Photo: JoJo Whilden©2012 CBS Broadcasting, Inc. All Rights Reserved.

7. Taking A Toll

A Reagan family friend, is killed, and Linda worries about Danny (Donnie Wahlberg) as his relentless search for the killer takes a toll on his emotional state, on BLUE BLOODS. Photo: JoJo Whilden©2012 CBS Broadcasting, Inc. All Rights Reserved.

8. Emotions Run High