When a petty officer is found dead and Vanceâ€™s brother-in-law, Michael Thomas, becomes a murder suspect, Vance puts pressure on Gibbs to prove his innocence. Meanwhile, Tony is disgruntled by a negative performance review and is determined to prove it wrong by being less chatty in the field...however unlikely a mission. At first the murder case looks to have clear motive when NCIS discover the officerâ€™s best friend was sleeping with the officerâ€™s girlfriend. But when the team uncovers an underground gambling ring that the officer lost all his money at and which Thomas was a part of, theyâ€™re able to link the murder back to him: the two got in a fight and Thomas accidentally killed him. Thomas begs Vance to help him out, but the director realizes he canâ€™t save him this time; however guilty he feels for letting his brother-in-law down, sometimes you have to let people go.