Book 1

The Cipher

by Isabella Maldonado

Published 15 September 2020

An Amazon Charts bestseller.

To a cunning serial killer, she was the one that got away. Until now…

FBI Special Agent Nina Guerrera escaped a serial killer’s trap at sixteen. Years later, when she’s jumped in a Virginia park, a video of the attack goes viral. Legions of new fans are not the only ones impressed with her fighting skills. The man who abducted her eleven years ago is watching. Determined to reclaim his lost prize, he commits a grisly murder designed to pull her into the investigation…but his games are just beginning. And he’s using the internet to invite the public to play along.

His coded riddles may have made him a depraved social media superstar—an enigmatic cyber-ghost dubbed “the Cipher”—but to Nina he’s a monster who preys on the vulnerable. Partnered with the FBI’s preeminent mind hunter, Dr. Jeffrey Wade, who is haunted by his own past, Nina tracks the predator across the country. Clue by clue, victim by victim, Nina races to stop a deadly killer while the world watches.


Book 2

A Different Dawn

by Isabella Maldonado

Published 10 August 2021

A Wall Street Journal bestseller.

For nearly thirty years a serial killer has been hiding in plain sight. So has the key to an FBI agent’s dark past.

A family is murdered as they sleep. FBI Special Agent Nina Guerrera and her new team are tasked with determining whether there is any link between this attack and another triple homicide from four years earlier and more than two thousand miles away. In the process, they’ll discover a serial killer so cunning that his grisly trail of death spanning nearly three decades has gone undetected. Each crime scene reminds Nina of the ghostly Latin folktale of La Llorona, which terrified her when she was an abandoned and vulnerable child. Now it’s back to haunt her.

Nina has known evil, but these macabre reenactments are as disturbing as they are baffling. Now she must uncover the meaning behind the rituals as the evidence leads her in an unexpected direction—far closer to home than anyone could have imagined. As the team narrows in on a suspect, the present collides with Nina’s past in a twist of fate that forces her to make the ultimate sacrifice.


Book 3

The Falcon

by Isabella Maldonado

Published 28 June 2022

A Wall Street Journal bestselling series.

A serial killer wants to play. FBI Agent Nina Guerrera has no time for games.

Six female undergrads at an elite university vanish. The media descends. The families demand action. And as Special Agent Nina Guerrera follows clue by chilling clue, she realizes she’s tracking the most cunning predator of her career.

The case takes a turn for the worse, and the bizarre, when several victims are found perfectly preserved. No signs of violence, no hint of how they died. Just more evidence that the killer is cruel, calculating, and a master of mind control.

With her mission compromised, Nina must face her greatest failure—and greatest fear—to stop a deadly hunter before he claims another prize.