She's an eighteen years old Dhampir trained to protect and kill vampires who's in love with a psychotic doppelgänger vampire. Despite her training and duty to eliminate bad vampires to protect the good vampires and the humans, she can't help but be drawn to the dangerous allure of her doppelgänger lover. As she struggles to balance her conflicting loyalties and desires, she must ultimately choose between duty and love, knowing that the consequences of her decision could be deadly. "You ain't nothin' but a troublemaker, Katherine." "Troublemaker that's your middle name Cassandra."