Believer by Ruthie Knox and Annie Mare

This women-run detective agency continues to deliver.

Believer is my favorite book in the Prairie Nightingale series so far, and I am already anxious for the next one.

The women-run detective agency continues to be one of my favorite parts of this series. Watching Prairie and her team divide and conquer as they untangle this cult was so satisfying to read. Joyce digging into shady histories, Emma partnering with ex-members for her podcast, and Prairie and Foster following the money undercover all show just how well this team works together. Everyone brings something different to the table, which makes the investigation feel layered and believable.
Prairie and Foster continue to grow closer in this one, and I love how well they complement each other. I am definitely rooting for them.

Meeting Prairie’s parents added another great dimension to the story. Their firsthand knowledge of high-control groups from their time on an Oregon commune gave the investigation some interesting depth, and I loved seeing them step in to help. Prairie’s daughters, Anabel and Maelynn, are growing up right along with the series, too, and their sneaky little spy mission had me both nervous and delighted.

Knox and Mare handle the cult subject matter with real care, while still delivering a mystery with plenty of twists that kept me guessing. I’m completely hooked on this series and even more invested in these characters after this book. Whatever comes next for Prairie and her team, I’ll be there for it.

Rating: 5 Stars

Release Date: September 8, 2026

If Believer sounds like your kind of read, you can pre-order a copy HERE or read it on Kindle Unlimited on release day.