When a government scientist goes missing, Abby is recruited to carry on his work, but the team worries that she may meet the same fate as her predecessor.

After entering cold case DNA into the system, Kasie solves a 30-year-old murder case, but a loophole in the legal system may set the suspect free. Also, McGee visits an…

Callen and Sam are shocked when an old acquaintance, who they thought was the recent victim of a murder, appears and asks for their help. As the team investigates, they…

Leslie, Ben, and Andy head to San Francisco for a National Parks Conference. Tom opens his restaurant, Ron has another run-in with his ex-wife Tammy 2, Andy lives a rock…