Meredith's dishonesty is revealed, leading to unexpected consequences for her and others; the new chief resident is chosen.
Sullivan draws on his on experience to deal with a violent army veteran. Meanwhile, Pruitt takes a stand to honour fallen firefighters.
Gibbs and the team assist Ziva with "the one thing" she said she would need to take care of before returning to see her family.
While pursuing a dangerous arms dealer, the team is shocked when Bishop is implicated in an old NSA leak; Gibbs and Marcie realise the killer they've been tracking may be onto them.
Following an active shooter lockdown at a naval hospital, the team searches for a suspect who fled the scene, someone from Sloane's past is a key witness in the case.