Aurelia Lavender has only 2 months left in New York before starting her next semester in Madrid. Bored and feeling like she has nothing keeping her in America, she's ready to change the course of her life. But when her brother Marino, who's involved in the mafia, kills the dons son and begins to fear for his sisters' life, he asks the cold and cruel hitman Casper Armani to protect her until she leaves. After all, nobody would dare cross Casper in fear of losing their life. Having skeletons in his closet and needing a favor because of it, Casper agrees. He is only given one rule: Don't fall in love. As the two get to know each other, that rule is really put to the test. When falling in love is forbidden, will Casper continue to protect Aurelia? Or will it become too much for his cold heart to handle?