Highlights from the Fourth Episode of Season 9 of NCIS

­The NCIS team searches for the person and motive behind a contract killer targeting a Navy Lieutenant Commander. Meanwhile, Abby uncovers new information about her family after undergoing tests for a kidney donation.­

Ducky

Ducky

The NCIS team searches for the person and motive behind a contract killer targeting a Navy Lieutenant Commander on NCIS.
Enemy on the Hill

Enemy on the Hill

The NCIS team searches for the person and motive behind a contract killer targeting a Navy Lieutenant Commander on NCIS. Pictured left to right: Jack Conley as Metro Detective Danny Sportelli, Mark Harmon as NCIS Special Agent Leroy Jethro Gibbs and David McCallum as Dr. Donald "Ducky" Mallard
Enemy on the Hill

Enemy on the Hill

The NCIS team searches for the person and motive behind a contract killer targeting a Navy Lieutenant Commander on NCIS. Pictured left to right: Jack Conley as Metro Detective Danny Sportelli, Mark Harmon as NCIS Special Agent Leroy Jethro Gibbs and David McCallum as Dr. Donald "Ducky" Mallard
Enemy on the Hill

Enemy on the Hill

The NCIS team searches for the person and motive behind a contract killer targeting a Navy Lieutenant Commander on NCIS. Pictured left to right: Jack Conley as Metro Detective Danny Sportelli, Mark Harmon as NCIS Special Agent Leroy Jethro Gibbs and David McCallum as Dr. Donald "Ducky" Mallard
Enemy on the Hill

Enemy on the Hill

The NCIS team searches for the person and motive behind a contract killer targeting a Navy Lieutenant Commander on NCIS. Pictured left to right: Jack Conley as Metro Detective Danny Sportelli, Mark Harmon as NCIS Special Agent Leroy Jethro Gibbs and David McCallum as Dr. Donald "Ducky" Mallard
 Metro Detective Danny Sportelli

Metro Detective Danny Sportelli

The NCIS team searches for the person and motive behind a contract killer targeting a Navy Lieutenant Commander on NCIS. Pictured left to right: Jack Conley as Metro Detective Danny Sportelli and Mark Harmon as NCIS Special Agent Leroy Jethro Gibbs
Enemy on the Hill

Enemy on the Hill

The NCIS team searches for the person and motive behind a contract killer targeting a Navy Lieutenant Commander on NCIS. Pictured left to right: Brett Tucker as Navy Lieutenant Commander Geoffrey Brett, Cote de Pablo as NCIS Special Agent Ziva David and Mark Harmon as NCIS Special Agent Leroy Jethro Gibbs
Navy Lieutenant Commander Geoffrey Brett

Navy Lieutenant Commander Geoffrey Brett

The NCIS team searches for the person and motive behind a contract killer targeting a Navy Lieutenant Commander on NCIS. Pictured left to right: Brett Tucker as Navy Lieutenant Commander Geoffrey Brett and Cote de Pablo as NCIS Special Agent Ziva David
Abby

Abby

Abby (Pauley Perrette) uncovers new information about her family after undergoing tests for a kidney donation, on NCIS.