Black Tie — Lynn Raye Harris

Abducted while on a business trip to Europe, Tallie Grant quickly realizes she's a commodity to be sold -- and there's no way out. Determined not to surrender to the man who buys her, she'll soon discover he's not what he seems. 

Mercenary Brett Wheeler has one task: infiltrate a human trafficking operation and get as much information as possible. But when Tallie takes her turn on the auction block, Brett risks his cover to free her -- by bidding to win. 

Someone watches from the shadows, determined to reclaim his thwarted prize. And when he does, Brett will need all his skills to find sweet Tallie again -- before she's gone forever.