In Peacock ’s mystery All Her Fault , Marissa Irvine (Sarah Snook) searches for her missing son. Composer Jeff Beal , who conducted some of the series’ music live at Deadline’s Sound & Screen Television, said the thriller score was the easy part. He also wanted to convey the characters with honesty.

“It’s kind of about a lot of people who are human beings making very difficult choices and often the wrong choice, a moral choice,” Beal said.

Jake Lacey plays Marissa’s husband, Peter. Peter’s not always the most supportive partner, but Beal gave him the benefit of the doubt — musically at least.

“Even Peter the husband, there’s some sort of weird logic that follows everything they do,” Beal said. “Peter was obviously a narcissist but he had his own justifications. So I try to write from honesty.”

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Marissa anchors the show but may be an unreliable narrator.…