Every Which Way by Lisa Phillips

She might’ve said yes, but happily ever after is harder than you think.
Kenna is determined to root out the mysterious “company” in the US, which means following the money trail to its source. With her team on the case in Denver, she’s got more to lose than ever before. When the investigation takes a break for wedding planning things don’t go smoothly, but is anyone really all that surprised? Having an FBI Special Agent in Charge for a fiancé should help…

Especially when things get messy.
The Banbury Investigations team tangles with local detectives in a missing persons’ case, runs into a criminal organization with a deadly agenda, and gets mixed up in the high society crowd at the heart of it. Kenna lands in a not-so-happy reunion with someone who is supposed to be dead in the middle of trying to reconcile the loss in her past with her plans for the future. Things always get worse before they get better, even when Jax shows up to help out.

This time her team is bringing their brand of justice.