A Wall Street Journal and Amazon Charts bestseller.

All defenses are down in the fifth Ace Security novel from New York Times bestselling author Susan Stoker.

Sarah Butler isn't flattered. She's angry and unnerved. She's been getting intimate gifts from a man she barely knows. Nothing threatening yet, but there's just a weird vibe she can't ignore. Her recourse is Ace Security. Their solution: self-defense lessons at Rock Hard Gym with a personal, hands-on instructor. One look at the bearded, tattooed, green-eyed alpha is enough to take Sarah's breath away.

Cole Johnson is definitely the man for the job. He's eager to train her. Eager to get closer. And when it comes to Sarah's instincts, Cole knows she's not imagining things. He's also not imagining the intense attraction between them--and his desire to protect her is growing. But so are Sarah's fears, the worst of which come true when she disappears.

Enlisting the help of Ace Security, Cole will stop at nothing to find the love of his life...before she vanishes forever.