Marissa Irvine, the protagonist of the Peacock thriller “ All Her Fault ,” bears a superficial resemblance to Siobhan Roy. For one thing, both characters are played by Sarah Snook , the Australian actor who broke out as the ambitious, oblivious heiress on “Succession.” Both women are wealthy, although Marissa — a wealth manager based in Chicago — is self-made. Both favor a quietly luxurious wardrobe heavy on tasteful neutrals and cocoon-like outerwear.

But the similarities end there. Marissa is defined by her motherhood, a phase of life Shiv was only beginning to contemplate at the end of “Succession.” The series, adapted by creator Megan Gallagher from the 2021 novel by Andrea Mara, begins when Marissa tries to pick up her 5-year-old son Milo (Duke McCloud) from a playdate, only

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