The team investigates an arson attack on a naval defense contractor on NCIS: Los Angeles. "Let It Burn" is the eighth episode of the show's 14th season.
(Hetty approaches Callen as he is sleeping, he wakes up staring at Hetty) Hetty: Did you catch him this time? You were twitching like a sleeping dog. Callen: Well, you now what they say about sleeping dogs. (looks at Hetty)