Major spoilers ahead for “Another Simple Favor”

Heading into “Another Simple Favor,” there was a pretty major question to consider: why would Stephanie Smothers ever agree to do another favor for Emily Nelson? And now that the film is out, the new question is: could it be Emily’s turn?

Now streaming on Prime Video, the sequel answers that first question pretty quickly. Stephanie Smothers (Anna Kendrick) agrees to be part of Emily Nelson’s (Blake Lively) post-prison wedding mostly because of a solid blackmail threat. When Emily crashes Stephanie’s book signing, she makes it clear that Stephanie’s refusal to come would result in not only exposing her secrets, but also suing her for using Emily’s name and likeness without explicit consent.

Lawsuits like that tend to be a real stoplight for books, particularly one that’s already struggling. And so, Stephanie jets off to Capri — literally...