Lucifer is on top of the world. The underworld, that is. He is what humans call, "the devil". Lucifer is happy forcing Souls to do labored work until Michael, Lucifer's brother, comes along to tell Lucifer some interesting news. He has a soulmate. That's right, Satan, who is supposedly soulless, has a soulmate who has extraordinary powers. Now he must decide whether or not he will truly let Charlotte steal his heart.