A gullible secretary named Sienna Blake anticipates a lovely Valentine's Day with her lover, but instead finds him having an affair with her sister, Vivienne Harper. She is left to pick up the pieces of her broken heart after being crushed and deceived. A vicious millionaire CEO named Mason Caldwell wakes up from a drugged-out night humiliated by an unidentified lady who takes his money and vanishes. His quest for her is fueled by his curiosity and pride. When Mason learns that Sienna is the one who robbed him, their worlds intersect, but their encounter leads to a contract marriage proposal and a strategic partnership that hides hidden secrets, mounting passion, and constant conflict in the bedroom and boardroom and boardroom.