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.”

Marissa anchors the show but may be an unreliable narrator. Beal doesn’t want to trick the audience, but he can reflect what drives her.

“I wouldn’t call it manipulating but it would be bringing the audience along,” he said, “not feeling you always had to use the drama in terms of pacing but letting moments stand emotionally, so when sh*t happens it’s really surprising. ‘Oh wow, something just happened.’ ”

Beal knew he could support the show’s plot twists and surprise revelations. Dealing with a missing child, he needed to emphasize the emotions of the mystery.

“The word motherhood is really I think the key to this,” Beal said. “There’s an element of the story that goes to this mythic connection between a parent and a child.”

Production company Carnival Film & Television alerted Beal that he had the budget for a full orchestra on All Her Fault. Knowing that, he wrote towards strings. “When you know you have the resources, you can write it,” Beal said. “Strings are great at really going to that emotion in a very honest way but also the thriller aspects. I can do all the fun stuff, scary stuff and creepy stuff.”

Check back Monday for the panel video.