Break it Down (Birch Police Department Book 4) by April Canavan

Chloe
A folded up flag is all that remains.
My older brother lost, in a mission gone wrong.
And every single day, I face the man responsible.
The man who couldn’t save him.
I’m not stupid.
I know he’s watching me.
Waiting for his chance to rescue me.
But he can’t. No one can.
All I want is a second chance at the future I should have had.
Before the misery Ian Keller brought into my life.
He owes me, and he knows it.
So when I show up to claim the debt, I don’t expect a fight.
Especially not one that leads to the best sex I’ve ever had.
Now I just have to convince him to let me go.
Because I’m not strong enough to walk away.

Ian
Her tears pour ice through my veins.
We both know there’s nothing I can do to stop her pain.
The sight of her holding that flag will haunt me until the day I die.
One night. One mistake. One failed mission.
Two families ruined forever.
I know the right thing to do is walk away.
Especially when I see rage in her eyes.
Chloe Young doesn’t need the trouble I’ll bring her way.
There’s only one thing I’m good for.
And it sure as hell doesn’t include fixing her.
With my expertise, I can break her down and tear her apart.
But I can’t put her back together again.
Not that she wants me to.
She’s stronger than she thinks.
Which she’ll have the chance to prove.
Because I have one more mission.
I have to walk away, leaving her behind.
And when I come home, she’s mine.