Sienna is the perfect secretary—beautiful, smart, and dedicated. However, behind her professional image, she harbors a dark secret. On certain nights, she transforms into a mysterious woman available for hire, but only selected men are allowed to meet with her, and all her clients must follow one strict rule: Sienna always wears a mask, hiding her true identity.Everything goes smoothly until one night, a special client appears—Lucas Blackwood, a handsome CEO and her own boss. Unaware of the woman behind the mask, Lucas becomes captivated by Sienna, not realizing that the woman he pursues at night is the same one who works beside him every day.Amid the pull of mystery, passion, and hidden identities, their obsession deepens. But how long can Sienna keep the truth hidden before everything is revealed?