Three years after surviving a political attack that killed her father, Margot Britton returns with a new name and a tough personality: Sienna Nilsson. Now a highly skilled agent, she enters the enemy's company by becoming the full-time bodyguard for Luther Vaughan, the rude and careless heir to the family that destroyed her. Luther is a great fighter who hates people in power. While they fight each other with minds and weapons, Sienna learns his secret: he hates his father's dishonest rule and wants to destroy the empire from within. As they spend all their time together, their work relationship turns into a deep, forbidden love. They team up secretly to stop his father, but a big lie separates them: Luther does not know that Sienna was created specifically to destroy his family. In a world of fake promises, can love last if it starts with revenge?