A lieutenant commander in Naval intelligence dies at an upscale addiction-rehab villa in Malibu, near Los Angeles; Kensi and Deeks go undercover at the spa; Eric and Nell give much help; the team solve the case and prevent a major tragedy.

During a Marine-sponsored charity-benefit volleyball tournament at Venice Beach, a car bomb explodes, killing two and injuring 29; promptly an aggressive TV reporter, Dana, says on the air that, according to sources, an Iran-based Islamic militant group, the JLF, is responsible for the bomb. One honcho at the DoHS firmly denies that the JLF is responsible; G and Sam lean on Dana, who gives a name; Eric finds another lead; Eric and Nell exchange notes; Kensi and Deeks chat with a man who believes in alien creatures who watch everyone; G and Sam make a productive stop at a car-rental shop; Kensi and Deeks learn some disturbing news; Dana dies, and Sam collars her killer, Bakri Deng, from South Sudan, who first refuses to cooperate; Kensi and Deeks learn about Deng, and Eric and Nell learn even more; G and Sam find the truth and an explanation, then, with Deng's help, they intervene with two other bombs and bombers and neutralize them. The foursome also receive love notes.