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.