But not every killer is the villain.
Title: The Serpent’s Order
Series: The Serpent Series Book 4
Author: 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!**
Amazon * Bookbub * Goodreads
Book Links
Amazon: https://amzn.to/49Zvnns
Bookbub: https://www.bookbub.com/books/the-serpent-s-order-the-serpent-series-book-4-by-sz-estavillo
Goodreads: https://www.goodreads.com/book/show/243031711-the-serpent-s-order
h3>Book Trailer
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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.
Author Links
Website: https://sonyoestavillo.com/
Facebook: https://www.facebook.com/sonyozofiaestavillo/
X: https://x.com/szestavillo
Instagram: https://www.instagram.com/szestavillo.author/
Bluesky: https://bsky.app/profile/szestavilloauthor.com
TikTok: https://www.tiktok.com/@szestavillo.author
Bookbub: https://www.bookbub.com/authors/sz-estavillo
Amazon: https://www.amazon.com/stores/S.Z.-Estavillo/author/B0D1NMYNBC
Goodreads: https://www.goodreads.com/author/show/49349032.S_Z_Estavillo
$20 Amazon or Paypal
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Direct link to the Contest: https://gleam.io/LNnBM/the-serpent-series
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