Review of the Seraphine Thomas Series by Erin Flynn (Books 1–18)
⭐️⭐️⭐️ (Overall)
I’ve officially read all 18 books in the Seraphine Thomas series - yes, all of them - so you don’t have to (but maybe you’ll want to). I’m a longtime fan of Erin Flynn’s writing. Her stories are creative, emotionally rich, and often addictive. There's always at least one character per series you end up rooting for, and her talent for immersive world-building is undeniable.
That said, my experience with this series has been a bit of a rollercoaster. Let’s break it down honestly - but respectfully.
🔥 The Positives:
Compelling Worldbuilding: The supernatural FBI + polyamorous twist is unlike most in the genre. Think Forever meets Castle with a Vampire Diaries vibe.
Long-Term Character Arcs: The series spans a wide timeline and shows dedication to character growth (even if not always in a direction I enjoyed).
Addictive Early Books: Books 1–7 had me hooked. They had humor, high-stakes emotional drama, and solid pacing. These earned a solid 3.5/5 stars from me.
😬 Mixed Feelings & Constructive Critique:
1. Tone and Authorial Voice
While the author’s writing style is generally engaging, I personally found some of the commentary in the closing author’s notes and certain narrative choices to feel more personal or opinionated than expected in fiction. I completely understand the need to address issues like piracy, but I believe there might be more neutral or inclusive ways to communicate those messages.
2. Relationship Complexity vs. Clarity
This isn’t a typical “Why Choose” or Reverse Harem setup. It’s a deeply layered polyandrous dynamic - messy, intricate, and sometimes emotionally chaotic. If you're looking for straightforward bonding arcs, be prepared: the relationship development gets incredibly convoluted. Personally, I found the shifting dynamics between mates, sirened partners, consorts, and friends-with-benefits confusing as the series progressed. A glossary or relationship map might be helpful in future installments.
3. Character Fatigue
By Book 18, I found myself struggling to connect with many of the characters - especially the main character, Sera. She starts off as a resilient, sharp, and likable FMC, but over time, her decisions and relationship management felt inconsistent or frustrating. The push-pull dynamic in her personal life, paired with very little progress in her supernatural education even 18 books in, made it difficult for me to continue rooting for her.
Many love interests were introduced with big emotional weight, only to fade into the background or disappear altogether. Some characters who were well-developed and emotionally resonant (like Dain or Tristan) seemed to get less closure or fair treatment than others who felt more peripheral. In contrast, some relationships dragged on without significant development or payoff.
4. Pacing & Structure
Books 8–18 dropped to a 2.5/5 rating for me. The pacing slowed, and more focus seemed to shift toward commentary and expanding the cast rather than continuing the central storyline. Political and social themes started to feel more prominent than the core plot, which I found distracting from the fictional narrative I was invested in.
🧍♀️Sera Thomas (FMC):
Early-series Sera was fantastic: witty, brave, emotionally complex, and vulnerable. I loved her journey through the early books. But as the series continued, her indecision, emotional volatility, and seeming lack of introspection made it harder to sympathize with her. She often reacted rather than reflected, and by Book 18, she felt less like a hero and more like a character stuck in loops.
💔 On the MMCs:
Too many to list fully, but here are some key points:
Tristan: Felt unfairly treated by both the narrative and Sera. He brought a lot to the story emotionally and deserved more.
Dain: A standout for me. Loyal, strong, and emotionally available. Frustratingly underappreciated by Sera.
Brian, Riley, Hagan/Reagan: Relationships with these characters didn’t feel satisfying or necessary by the end.
Noah, Axel, Eugene, Jason: Struggled to leave a lasting impression. Some started strong but faded, others never quite clicked.
Carter: Felt like his storyline was mishandled. A simple conversation would have solved a lot.
Ari, Virgil, Lucca, etc.: Either forgotten or sidelined. At 18 books in, I’m struggling to remember who’s still important and who isn’t.
⚠️ Final Thoughts:
This series started with a bang but has become increasingly complex - sometimes at the expense of clarity, pacing, and emotional payoff. I’d still recommend it to readers who enjoy dark paranormal romance with poly themes, complex emotions, and an ongoing world that spans dozens of characters.
But for me, the series may have reached its natural peak. I’m unsure whether I’ll continue with future books unless there’s a notable shift in focus and tone. Still, Erin Flynn’s creativity and dedication to her characters is commendable, and I hope future installments bring some much-needed resolution to long-standing arcs.
TL;DR:
Started strong with a bold and complex heroine in a unique supernatural world. Became bloated with characters and unresolved plot threads. A frustrating but ambitious series worth reading - if you have patience.