Only the Lovely (The Sinful State Series #3) by Isabel Jolie
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Three years ago in Monaco, a billionaire heir spent one unforgettable weekend with a captivating woman named Sophie, who vanished by sunrise and left no trace. Now she’s sitting across from him in a security briefing under a different name, the undercover operative assigned to expose the blackmail ring operating inside his exclusive Manhattan pleasure club. As they move through the city’s glittering elite hunting for a traitor, he’s determined not to let her slip away again, even if it means risking everything he’s built.