Brief episode synopsis:
- Sam is sent undercover as a bomb specialist as the team races to locate stolen explosives somewhere in the city.
- Hunter changes the dynamics of the team and has Callen partnered with Kensi and Sam (amusingly) with Deeks.
- The team is unable to defuse the bombs in time but escapes unharmed, with the perpetrator stuck inside.
- Hunter had been working this case undercover for some time, and leaves to continue its next phase.
- Hetty returns and shares some of the details of Callen's past with him at last.