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.
HankMed treats a reporter; Evan and Paige's relationship is questioned through mudslinging; Hank wonders about Molly's behavioural problems; Shelby questions Hank's use of medication.