Billionaire Protector by Melanie Knight

Sarah Sloan: Harmony Creek Sheriff, former town criminal (possibly), purveyor of secrets (definitely)
After a rough childhood, Sarah fought her way to become Harmony Creek’s top cop. She hides the secrets of her past, forging the future she’s always desired. Exploring the scene of an arson late one night, she spies a shadowy figure prowling the darkness. Just as she’s about to arrest him…
He captures her instead.

Cole Carter: Harmony Creek Deputy, son of former sheriff, military hero
After a life-changing stint in the military, Cole Carter is back home and ready to jump into his new law enforcement career. He’s already catching criminals his first night on the job when he finds a trespasser. He’s not at all surprised when he discovers it’s his childhood nemesis a.k.a. former town crook. Only, she’s not actually a criminal.

She’s his new boss.
Now he’s working under her, discovering an entirely new woman from the girl he knew. Every moment reveals a new truth, as the attraction he once thought gone is back and growing. She might be in charge, but he’s not giving up control.

He’s going to discover every secret… and why she affects him so much.