When a Navy Admiral’s daughter is the prime suspect in a double murder case aboard a research boat, the NCIS team partners with the Coast Guard Investigative Service (CGIS) to work the case. Meanwhile, Lasalle tracks down his estranged brother. Diane Neal returns as CGIS Special Agent Abigail Borin on NCIS: New Orleans, Tuesday, Jan. 13 at 9/8c. Only CBS.