Kiss Me First TV Tie-In Edition by Lottie Moggach

When Leila discovers the website Red Pill, she feels she has finally found people who understand her. A sheltered young woman raised by her mother, Leila has often struggled to connect with the girls at school; but on Red Pill, a chat forum for ethical debate, Leila comes into her own, impressing the website's founder, a brilliant and elusive man named Adrian. Leila is thrilled when Adrian asks to meet her, and is flattered when he invites her to be part of "Project Tess." Tess is a woman Leila might never have met in real life. She is beautiful, urbane, witty, and damaged. As they email, chat, and Skype, Leila becomes enveloped in the world of Tess, learning every single thing she can about this other woman--because soon, Leila will have to become her.