Using a necklace and a microwave transmitter, Mac and the team attempt to locate Riley after her first solo mission with a group of dangerous hackers goes off the rails

Mellie manages to make a public gaffe whilst Olivia attempts to fix it. David Rosen looks for advice on dealing with his love triangle with Liz and Susan.

Gibbs and Senior FBI Agent T.C. Fornell unite after two British prisoners, including a former spy, escape and arrive stateside via a shipping container. Also, McGee is busy apartment hunting…