Every crime tells a story…
But not every killer is the villain.
The Serpent’s Order
The Serpent Series Book 4
by S.Z. Estavillo
Genre: Thriller, Romantic Suspense
An assassin bound by obedience. A detective marked for death. A cartel war with no survivors.
Von Schlange thought she’d escaped her past. Now Black Nova owns her—an elite, off-the-books task force where obedience is survival and failure means death. As their newest assassin, she’s unleashed on targets tied to Jaxon Ryker, a drug lord buried deep in the Alaskan wilds.
Her partner, Xander Holt, a former Navy SEAL with ice in his veins, lives by the same brutal code: no attachments, no lines crossed. But as missions turn bloody, the fragile boundary between partner and lover begins to blur—and desire becomes its own kind of danger.
Across the country, Detective Anaya Nazario faces a nightmare of her own. A synthetic “zombie drug,” deadlier than fentanyl and immune to Narcan, is ripping through Los Angeles. Her investigation exposes a network of dirty cops shielding Ryker’s empire—and puts a target squarely on her back.
Two women on opposite fronts. One war against corruption and cartel power. And a single truth—every betrayal leaves a body behind.
Explosive, unrelenting, and razor-sharp, The Serpent’s Order propels the Serpent Series into its most dangerous chapter yet—where justice is a myth, and survival comes at a price paid in blood.
**NEW RELEASE on Feb 10, 2026! PreOrder Now!**
Twilight of the Serpent
The Serpent Series Book 3
Some predators hide in plain sight. Others hunt from the shadows.
Merrick Winslow is a decorated Army officer, a man of discipline and honor—or so he claims. When he reports that his ex-wife, Cheonsa Soo-Min, has been stalking him, no one questions his story. He paints her as unstable, vengeful, and dangerous, a woman consumed by obsession. But when two officers are gunned down with her own weapon, the truth becomes harder to see. With the law closing in, Cheonsa vanishes, fleeing to Rio de Janeiro, where she is taken in by Von Schlange, the vigilante thought to have disappeared for good.
Von has retired her vengeful ways, leaving behind a life of bloodshed to run a quiet veterinary clinic. But when Cheonsa’s past collides with Winslow’s lies, the two women begin to unravel a deadly deception—one that turns predator into prey. By the time Von uncovers the truth, an innocent life has already been taken.
Now, there’s only one thing left to do: find the real monster and make him pay.
Meanwhile, in Los Angeles, Detective Anaya Nazario and Supervising Special Agent Blake Huxley are adjusting to life as new parents. But after only four months of maternity leave, Nazario is pulled back into the field to investigate the murder of two officers. What should be a straightforward case quickly spirals into something far more sinister—secrets buried beneath the badge, a killer hiding behind a uniform, and a web of corruption stretching further than anyone expected.
As Nazario and Huxley chase down leads, their investigation intersects with a vigilante they once thought was dead. And this time, Von Schlange isn’t just seeking justice—she’s delivering retribution.
For fans of Karin Slaughter, Gillian Flynn, and Taylor Adams, Twilight of the Serpent delivers a high-stakes vigilante thriller packed with morally gray justice, relentless suspense, and a tangled web of deception. Perfect for readers who love strong female leads, intense cat-and-mouse chases, and dark psychological twists.
The Serpent Woman
The Serpent Series Book 2
The exciting sequel to The Serpent’s Bridge…
A serial killer is on the loose. With her insidious tattoo and venomous killer strike, they’re calling her the serpent woman.
Two of the best in their field, LAPD Detective Anaya Nazario and FBI Supervising Special Agent Blake Huxley are forced to work together yet again, despite their strained romantic history and a baby on the way. Together on a nationwide hunt, they must find this serpent woman before she strikes again.
But, as the cat-and-mouse chase evolves, Nazario and Huxley begin to realize that their killer is on a mission of vigilante justice and they must struggle with the question of who really deserves their justice: The killer, or her victims?
This dark thriller delves into the sensitive topics of sex trafficking, child abuse, animal death, sexual assault, graphic violence, and dead bodies. Reader discretion is advised.
The Serpent’s Bridge
The Serpent Series Book 1
Compelling dialogue, rich, gritty prose, and characters you won’t forget — if you loved The Girl Who Kicked the Hornets Nest by Stieg Larsson, or Ink and Bone by Lisa Unger, you’ll love The Serpent’s Bridge.
Recovering alcoholic Detective Anaya Nazario remains haunted by her father’s murder. Lucas Nazario was the highest-ranking Puerto Rican LAPD detective, and his case has gone unsolved for twenty-four years since his murder. When Mexican immigrants are targeted by a serial killer, Nazario senses a connection and fights to keep the leadless case open. The homicide investigation centers on Sanctuary Baptist, a church composed of immigrants led by Pastor Stan and his wife. Nazario’s personal and professional worlds collide when she is compelled to collaborate with her former lover, Special Agent Blake Huxley. As their lives merge once more, the FBI and Detective Nazario stop at nothing to find a killer.
Is this the same monster who killed her father and left him for dead under a bridge?
Can she put a stop to the murders before more families lose loved ones?
As a BIPOC thriller author, she previously parted amicably with her agent and, three months later, secured an eight-book deal with Oliver-Heber Books—now boasting 24,000 downloads in its first year and a BookRaid bestseller ranking in the thriller category. The Serpent Woman (Book 2) reached #1 on Amazon and topped all three of its categories. Her background spans literary agencies and TV studios, where she contributed to greenlit screenplays that became Lifetime movies. She holds a Master’s in Television, Radio, and Film, has taught author branding workshops (L.A. Writer’s Conference, North Texas RWA), and maintains a 100K+ social media following.
Website * Facebook * X * Instagram * Bluesky * TikTok * Bookbub * Amazon * Goodreads
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Sounds like a good detective series.
This sounds like a really good romantic suspense. I would enjoy reading it.
Romance and Suspense! I'll enjoy reading this!
Hope the book does great!
This sounds like an interesting series. Great cover too.
This is a new series for me, as well as a new author. I am looking forward to reading the books.
This sounds like a great series. I like the covers.
Thriller, Romantic Suspense - This genre ensures a great series!
Thank you for the excerpt.
Sounds like a great series.
Great cover
This sounds like a great series.
Do you have any advice for new writers?
This book sounds like a very intriguing read. Thanks!
Looks like a very good series with perfect cover art.
Looks very exciting Do you write in a daily journal?
Sounds like an exciting book!
I like the book details.
I would love to read this.
The Serpent Series looks awesome!! I love all of the covers.
This looks like an exciting series! Thanks for the giveaway!
I love reading thrillers.
I think the cover is very nice.
I like the book cover a lot, it's very intriguing!
This looks like great book!
This looks like a great thriller series
I really like the book cover. This sounds like a book I would love to read
This sounds like an interesting book and I also like the cover.
Looks like a good read
This sounds like an intense thriller with interesting characters.
I am so adding this one to my must read list.
Sounds like an exciting series.
My favorite genre to read.
This series looks good. Like something I'd enjoy.
This looks like a really great series - very much one I would enjoy getting into!
Sounds like a good mystery/romance combo. Would enjoy reading the whole series.
Sounds like a lot of things going on in this one but I was sold at zombies!
I like book details
Looks like a fascinating series.
Cool Cover!
cant wait
I like the color scheme used on the covers of the books!
Looks cool!
The book series's title and motif is very interesting to me. I wonder what the "Serpent" entails.
The book covers ambiance fits the genre well.
If I were to win I would use the GC to buy the books sounds interesting.
like the cover
The cover's pretty good
This sounds so good! Thanks so much for sharing it!
The color theme, fog in the background, foggy/smoky font, and an overall eerie, late-night vibe... These cover designs are perfect.
Vigilante? yes!! I'm in, lol
This sounds like an awesome series! Added to my tbr!
Oh no the past never stays in the past sounds like an exciting book.
Looks like a very inviting cover! Can't wait to read it!
Can’t wait to read. Sounds like an awesome series.