Saber Fool's Day (Saber Sisters #4)
Dawn Dugle

Tatted-up Ryker Navarro’s time as a Green Beret ended with secrets and lies. He took a job at Saber Security to put the lies behind him. But when your boss asks you to go undercover to help his sister-in-law, you don’t say no - even if it means giving her the wrong name.
Pretty soon, they’re at each other’s throats.
To bring in an escaped serial killer, they’ll have to put aside their differences before death comes calling for both of them.
Saber Fool’s Day is a standalone, happy ever after romance, with no cheating. There is salty language and sexy times that are for mature audiences only.