FROM USA TODAY BESTSELLING AUTHOR SIERRA CARTWRIGHT Book one in the Mastered series. Julia Lyle will have nothing to do with domineering men, no matter how tall, dark, or devastatingly sexy. But billionaire Dominant Marcus Cavendish will stop at nothing to possess the fiercely independent Julia. At her friend’s wedding, fiercely independent Julia is stunned when the bride kneels to accept her husband’s collar. Before she can process her shock, the firm relentless hands of a gorgeous billionaire clamp down on her shoulders—a subtle warning not to interfere. After the ceremony, the masterful tycoon offers her a glimpse of her friend’s lifestyle. Following a devastating heartbreak, Julia wants to marry a nice man, making the enigmatic and powerful Marcus Cavendish an unlikely choice. With his self-assured arrogance, the billionaire embodies everything she’s not looking for. Yet, she finds herself irresistibly drawn to his commanding presence and raw sensuality. Marcus hasn’t been intrigued by a woman for a long time, but Julia’s entrancing blend of naivety and luscious curves ignites a desire he can’t deny. Determined to claim her heart, he vows he’ll do whatever it takes. Will Marcus be able to persuade the skeptical beauty that she’s meant to be his forever? The stunning, bestselling Mastered series is back in a special tenth-anniversary edition featuring additional scenes. With This Collar is a steamy billionaire romance novel. Welcome to the spectacular Colorado mountains where masterful billionaires ignite the fantasies of the women they love. All books are standalone novels that can be read in any order and have a guaranteed happily-ever-after ending.