Sex is in the air as Gob seduces his father's former secretary, Lindsay and Tobias go see a marriage counselor, and George Sr. and Lucille have a bizarre conjugal visit.
Frank must deal with the fallout after a newly-retired NYPD lieutenant is accused of shooting a mugger on the subway.
Charlie is very offended when Alan chooses their unintelligent cousins to be Jake's guardians if he dies.
When agent Lance Hamilton's partner is killed, Sam dons his previous undercover persona of `Switch' to find the culprit; Kensi, Deeks, Roundtree and Kilbride work to catch an aerospace engineer who stole classified navy schematics.
Herrmann must make a tough decision, and Casey tries to keep a tornado shelter open. Meanwhile, Brett and Dawson feel the effects of their actions.