There are 4 books in the Sydney Rose Parnell Series series. The newest book is Gone to Darkness which came out in 2020.

1
Blood on the Tracks

Book cover of Blood on the Tracks
An Amazon Charts bestseller.

A young woman is found brutally murdered, and the main suspect is the victim's fiance, 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…
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2
Dead Stop

Book cover of Dead Stop
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…

3
Ambush

Book cover of Ambush
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…

4
Gone to Darkness

Book cover of Gone to Darkness
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…