In Season 2 of the Irish hit “Bad Sisters,” the darkly comic, seriously homicidal happenings continue.

Co-writer and producer Sharon Horgan plays Eva, the eldest of Dublin’s five Garvey sisters. Along with Ursula (Eva Birthistle), Bibi (Sarah Greene) and Becka (Eve Hewson), they decided in S1 they had to rescue their sister Grace (Anne-Marie Duff) from a horribly abusive marriage with sadistic, endlessly manipulative Jean-Paul (Claes Bang).

Their “bad” solution? Murder – disguised as an “accidental death.”

S2 begins two years later with a surprise: Grace has really moved on and is newly married.

“Grace,” Duff acknowledged in a Zoom interview, “is such a lost soul, isn’t she? She feels like she doesn’t exist unless she’s inside of a relationship. And any relationship will do!

“So she’s prepared to attach herself to some very unhealthy people in order to find some kind of security. It’s a huge journey as to how her relationship with her new husband will go. He’s very different to Jean-Paul, so it’s very interesting.”

Duff, so memorable in films like “The Magdalene Sisters” and “Nowhere Boy,” won both a British Academy Television Award and an Irish Film and Television Award as Grace, who seems like a wounded bird.

“She is like a wounded bird, isn’t she? She’s lost her wings and so she’s ground-bound. That’s the sadness of her, really. That she’s trapped.

“She was trapped inside a very unhealthy marriage, and now she’s trapped inside this secret (of what she did).

“Although we see her full of joy and happiness at the beginning of Season 2, we know that she can’t take flight because she is weighed down by this awful guilt that she has — and the knowledge that there will be comeuppance.”

She’s also constantly with a glass of wine. Is Grace a functioning alcoholic?

“I think,” Duff, 52, answered, “she desperately needs to anesthetize. Because in order to keep moving forward, she has to pretend there’s nothing behind her.

“And the way to do that for her is to make everything a little bit blurry around the edges. Which I think a lot of people are guilty of doing, aren’t they, with trauma?

“We hint at her losing control. She seems like she has everything sorted. But actually she’s slowly falling apart.”

“Bad Sisters” had a phenomenal homeland reception with weekly viewing parties. None of the cast had signed on with any provision for another season.

“It’s so extraordinary when you realize that something has taken off and is really loved by audiences. You never know,” Duff added from experience. “You throw things out there and you hope that they stick. And this one really did.”

“Bad Sisters” Season 2 premieres 2 episodes on AppleTV+  Nov. 13.