Vera receives an unexpected call from Bugs, who claims he's ready to answer more questions from prison after being identified as the sniper known as "Sandman." When she arrives, Bugs has suddenly changed his mind, prompting the team to reconsider the case and race against the clock to try and stop another tragedy.

When the murder of Pedro Hernandez is unearthed, Gibbs faces a reckoning. But when he needs his team most, the loyalty of one is brought into question.