Before writer/director Mark Anthony Green pivoted to filmmaking, he was an editor at GQ Magazine — he knows the world of celebrity journalism and its opulent press junkets, which provides the setting for his directorial debut, “Opus,” a satirical, cynical riff on cults of personality.

The GQ editor-turned filmmaker’s new A24 movie is a warning against tribalism and cults of personality, and was made with such modest means that he felt the need to lead by example: “Every time we break a window,

The "Opus" ending has a twist that makes audiences reconsider how they view Moretti, John Malkovich's mysterious pop star turned cult leader.