Liberty or Death — Kate Flora

Thea Kozak's sometimes rocky relationship with Maine state police detective Andre Lemieux has flourished. Now, on the day of their wedding, Thea receives awful news: Andre has been taken hostage by a militant militia group. Their terms: release one of their members from jail.
The State of Maine isn't interested in co-operating. Neither is the prisoner.
Taking the situation in-hand, Thea goes undercover in the town where she suspects Andre is hidden, and comes face-to-face with the most terrifying and ruthless adversaries of her life.

THE THEA KOZAK MYSTERY SERIES, in order
Chosen for Death
Death in a Funhouse Mirror
Death at the Wheel
An Educated Death
Death in Paradise
Liberty or Death
Stalking Death
Death Warmed Over