The Serpent Series, Book 4
Thriller
Date Published: 02-10-2026
Publisher: Oliver-Heber
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.
Review
This book does a great job of mixing action, emotion, and morals and big choices in all the right ways.
Along the way Von Schlange and Xander Holt navigate betrayal, loyalty, and a growing attraction that could get them both killed.
What I loved most is that no one in this book is purely good or bad. Everyone’s got secrets and scars, and Estavillo really digs into what drives them. The pacing is quick, the writing is sharp, and the action scenes are cinematic.
While being a part of the Serpent series, it stands strong on its own too.
About the Author
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.
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