There are 5 books in the Sam Kovac and Nikki Liska series. The newest book is The Bitter Season which came out in 2016.

1
Ashes to Ashes

Book cover of Ashes to Ashes
Kate Conlan, an ex-FBI agent turned advocate, finds herself protecting a teenage runaway who has witnessed the latest murder by the "Cremator" - a serial killer who burns women alive.
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2
Dust to Dust

Dust to Dust
New York Times bestseller Tami Hoag is at the top of her form in her newest thriller, blending unforgettable characters, breakneck suspense, and chilling twists. It is the story of two hard-boiled cops who dare to cross the thin and dangerous line that separates good and evil as they risk…

3
Prior Bad Acts

Book cover of Prior Bad Acts
New York Times bestselling author Tami Hoag returns with a thriller that begins with a shocking crime scene you’ll never forget and follows two relentless detectives on a manhunt that ends in a chilling confrontation with the essence of human evil.

It was a crime so brutal, it changed the…

4
The 9th Girl

Book cover of The 9th Girl
#1 New York Times bestselling author Tami Hoag brings back her fan-favorite Minneapolis investigators Sam Kovac and Nikki Liska in the haunting new thriller The 9th Girl.

"Kovac had seen more dead bodies than he could count: Men, women, children; victims of shootings, stabbings, strangulations, beatings; fresh corpses and bodies…

5
The Bitter Season

Book cover of The Bitter Season

In THE BITTER SEASON, Tami Hoag - the Sunday Times bestselling author of A THIN DARK LINE - returns with book five in the gripping Kovac & Liska detective series. 'As good as Michael Connelly or Karin Slaughter at their best.' Mark Edwards, No. 1 Kindle bestseller

A middle-aged couple…