Yuja Mann is a sixteen-year-old girl living in 2084 who knows how to text the people of 2013. She's also a serial killer. She thought she had found the boy of her dreams when Troy Mehrtaba, the coolest boy in her class bar one, treated her to a one-on-one vodka-and-hottub party at his parents' posh penthouse flat in Chelsea, London. Then the very next day, she caught him snogging the face off Justine, the class slut, and just wanted to deep-six them both. Unfortunately the day after, Troy was transferred to new pukkas (public classes) in another part of London. His replacement, a boy called Harry, gave Yuja a shock when he told her he knew about her crimes and was going to make her pay for them...