The HBO publicity department is pretty good at keeping secrets, huh? Last week, the season premiere of “The Righteous Gemstones” featured an unexpected guest star: the 12-time Oscar nominee Bradley Cooper. This week, “The White Lotus” brings in the Oscar-winning actor Sam Rockwell, whose participation in this season had been kept pretty tightly under wraps, right up to the moment he appeared onscreen as Frank, Rick’s old friend in Bangkok.

Rockwell is not this episode’s main character. But he does deliver a knockout monologue that is one of the season’s standout scenes. And his speech would likely be the most talked about “White Lotus” moment this wee, were it not for the rather shocking kiss at the end of the episode.

I will get to the smooching, I promise. But I want to start with Frank, who meets Rick at a nice hotel, bringing with him something Rick needs for when he confronts his father: a heavy bag containing a big gun. We are not told how these two men know each other or why one of them is holding on to an arsenal. But clearly they have a close friendship, which has apparently involved some violent exploits.

This episode is a direct continuation of last week’s, which had several characters heading out to various decadent parties, joining the locals in celebrating the full moon. The “White Lotus” creator and director Mike White does a lot more intercutting between the story lines than usual, creating a feeling that night itself has its own dark, strange momentum as people across Thailand get increasingly intoxicated.

But the episode breaks from that delirium for one long speech from Frank, who has to explain to his old friend why he has embraced Buddhism and given up booze, drugs and sex.

Frank’s story is too raunchy to repeat in fine detail. It involves him interrogating the nature of desire and the role gender identity plays in lust — all of which led to him experimenting with cross-dressing and gay orgies before coming to the conclusion that “sex is a poetic act; it’s a metaphor.” But for what? That remained frustratingly unclear to Frank, which is why he become a Buddhist, detaching himself from the wheel of lust and suffering.

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