Benjamin Srisai 1935 – 2002 Karla has a secret that will affect Keith and David. Ruth prepares to move ahead with Nikolai. Brenda faces anxiety about the engagement.

Booth asks Brennan to help locate and identify the remains of a six-year-old boy, Charlie, who went missing from a local park.

As Rossi, Morgan and JJ profile a killer who is targeting an emergency room doctor, Prentiss realizes that Hotch is missing.