Book 1

The Third to Die

by Allison Brennan

Published 4 February 2020
"The first in Brennan's amazing new thriller series. Dive in and enjoy this nail-biter."--Catherine Coulter, NYT bestselling author of LABYRINTH

An edgy female police detective...An ambitious FBI special agent. Together they are at the heart of the ticking-clock investigation for a psychopathic serial killer. The bond they forge in this crucible sets the stage for high-stakes suspense.

Detective Kara Quinn, on leave from the LAPD, is on an early morning jog in her hometown of Liberty Lake when she comes upon the body of a young nurse. The manner of death shows a pattern of highly controlled rage. Meanwhile in DC, FBI special agent Mathias Costa is staffing his newly minted Mobile Response Team. Word reaches Matt that the Liberty Lake murder fits the profile of the compulsive Triple Killer. It will be the first case for the MRT. This time they have a chance to stop this zealous if elusive killer before he strikes again. But only if they can figure out who he is and where he is hiding before he disappears for another three years. The stakes are higher than ever before, because if they fail, one of their own will be next...


Book 2

Tell No Lies

by Allison Brennan

Published 30 March 2021

Book 3

The Wrong Victim

by Allison Brennan

Published 26 April 2022

From New York Times bestselling author Allison Brennan comes a gripping new thriller.

A lethal attack with no clear motive…and a killer dead-set on keeping the truth buried.

A bomb explodes on a sunset charter cruise out of Friday Harbor at the height of tourist season and kills everyone on board. Now this fishing and boating community is in shock and asking who would commit such a heinous crime—the largest act of mass murder in the history of the San Juan Islands.

Was the explosion an act of domestic terrorism, or was one of the dead the primary target? That is the first question Special Agent Matt Costa, Detective Kara Quinn and the rest of the FBI team need to answer, but they have few clues and no witnesses.

Accused of putting profits before people after leaking fuel endangered an environmentally sensitive preserve, the West End Charter company may itself have been the target. As Matt and his team get closer to answers, they find one of their own caught in the crosshairs of a determined killer.

Don’t miss THE MISSING WITNESS, the brand-new page-turning thriller from New York Times bestselling author Allison Brennan!


Book 4

Seven Girls Gone

by Allison Brennan

Published 25 April 2023

Book 5

The Missing Witness

by Allison Brennan

Published 23 January 2024

"This latest installment will likely satisfy Quinn and Costa’s loyal followers and attract those curious about the interplay between public policy, law enforcement, and politics." —Booklist

When a key witness goes missing, Quinn & Costa must find her before a killer silences her for good…

Detective Kara Quinn is back in Los Angeles to testify against a notorious human trafficker, finally moving past the case that upended her life. But when the accused is shot in broad daylight, the chaotic scene of the crime turns up few reliable bystanders. And one witness—a whistleblower who might be the key to everything—has disappeared.

After another person close to the case is killed, it’s clear that anyone who knows too much is in danger, and tracking down the witness becomes a matter of life-and-death. But as explosive secrets surface within the LAPD and FBI, Kara questions everything she thought she knew about the case, her colleagues and the life she left behind months ago.

Now with FBI special agent Matt Costa’s help, she must race to find the missing witness and get to the bottom of the avalanche of conspiracies that has rocked LA to its core…before it's too late.


Book 6

See How They Hide

by Allison Brennan

Published 7 January 2025