Holt asks for Jake's help in a case that is exceptionally meaningful to him. Charles and Terry work together on a side business.
Director Vance is notified by the Pentagon that the nuclear submarine Gibbs and Bishop are aboard to conduct a murder investigation has gone radio silent.
The Fly Team and new Europol liaison Megan "Smitty" Garretson investigate when an American police detective on the Federal task force is murdered in Paris.
MacGyver and team are asked to solve a locked-door mystery when a man working inside a remote, ultra-secure international seed vault disappears.
When Nell sends Sam to meet an informant who plans to blow the whistle on a military secret, Hanna's life is in danger when the man tries to run him down and kill him. Also, Kensi and Deeks debate whether or not to buy their first house.