When a multi-agency raid is ambushed by the cartel, the NCIS LA team investigate for a mole. Instead of a mole, they find that the FBI and CA agents' phones were hacked. The hacker is a 15-year old school girl, Cindy Chang. She hacked the phones of nine girls to find out what they were saying about her.
Cindy befriended a mysterious guy who hacked into her phone and used her code for blackmail and to sell the information. Through Cindy, NCIS was able to track him down and take him into custody.