Book 1

Blood on the Tracks

by Barbara Nickless

Published 1 October 2016
An Amazon Charts bestseller.

A young woman is found brutally murdered, and the main suspect is the victim’s fiancé, a hideously scarred Iraq War vet known as the Burned Man. But railroad police Special Agent Sydney Rose Parnell, brought in by the Denver Major Crimes unit to help investigate, can't shake the feeling that larger forces are behind this apparent crime of passion.

In the depths of an icy winter, Parnell and her K9 partner, Clyde—both haunted by their time in Iraq—descend into the underground world of a savage gang of rail riders. There, they uncover a wide-reaching conspiracy and a series of shocking crimes. Crimes that threaten everything Parnell holds dear.

As the search for the truth puts her directly in the path of the killer, Parnell must struggle with a deadly question: Can she fight monsters without becoming one herself?

Book 2

Dead Stop

by Barbara Nickless

Published 3 October 2017
The search for a missing child leads a courageous railway cop down a twisted trail of murder.

It’s been five months since Special Agent Sydney Parnell survived a violent confrontation with a gang of brutal thugs, an encounter that left her physically and emotionally scarred. Deep down, Sydney fears she isn’t ready for another investigation. But when a woman is murdered on the train tracks and a child goes missing, she knows she’s the only one who can lead the hunt for the killer. While Denver police and the FBI chase down blind alleys, Sydney focuses on a single cryptic clue left behind at the crime scene—one that will send her down a path of greed, violence, and long-ago love.

With Denver beset by a series of monsoonlike thunderstorms that threaten to flood the city, Sydney and her K9 partner, Clyde, must wade through a murky trail of murder that stretches back thirty years—all to rescue a child…and catch a killer with a long memory and an insatiable appetite for destruction.

Book 3

Ambush

by Barbara Nickless

Published 19 March 2019
A Wall Street Journal bestseller.

The gripping third book in the bestselling Sydney Rose Parnell series.

Railway cop and former Marine Sydney Parnell is on the hunt. So is a killer she knows only as the Alpha. They’re in a race to find Malik, an eleven-year-old Iraqi boy with secrets to guard. Sydney wants to help him. The Alpha wants him dead.

From the dark alleys of Mexico City to the mean streets of Denver, Sydney and her K9 partner, Clyde, use their wits and determination to chase down the ruthless killer. But when their path collides with his, Sydney realizes just how far-reaching and sinister the Alpha’s past is. And how far he’s willing to go to save his secrets.

Book 4

Gone to Darkness

by Barbara Nickless

Published 1 May 2020
From a Wall Street Journal bestselling author. Newly minted homicide detective Sydney Parnell faces a savage killer whose endgame is to capture her. And keep her.

Iraqi war vet and former railway cop Sydney Parnell is now the youngest homicide detective in Denver’s Major Crimes Unit. In the past, gut instinct has served her and her K9 partner well. But it’s not a trait Len Bandoni, her old nemesis turned reluctant mentor, admires. Not until Sydney’s instincts lead to their first case: a man tortured and beaten to death, then left in a refrigerated train car with cryptic messages carved into his body.

The victim is a well-liked member of an elite club called the Superior Gentlemen. At first glance, the club appears harmless. But beneath its refined surface swim darker currents.

As Sydney; her K9 partner, Clyde; and Bandoni investigate the grisly murder, the three develop a bond that carries them through a shocking series of crimes and a horrifying conspiracy that threatens the detectives’ lives and promises to bring their beloved city to its knees.