When Adella Valentino agrees to marry Leo Cifarelli, heir to the Cifarelli Syndicate, she gives up hope of ever experiencing a loving relationship. Leo is cunning, aloof and entirely lethal, and has treated her like a burden her whole life. But when the death of a rival forces the couple into hiding, Leo's behaviour suddenly changes; he reveals a new side of himself - one that wants to claim her. As they are trapped in each other's presence, Leo's beguiling grin and alluring darkness invite Adella deeper, daring her to submerge herself in the darkest corners of him and swim in a sea of sins with him. But Adella is hesitant. She worries that it might all be a game to Leo - one she is about to lose. When she finally succumbs to temptation, one thing becomes crystal clear: Leo is a dangerous man who must never be underestimated.