Diana is in her final year of high school and has always been good at most things – except for getting friends. Or a boyfriend. One day a new boy shows up at school, called Simon. He’s handsome and better than her at maths, and when Simon shows interest in Diana she doesn’t know what to do. She can’t understand why this charming boy everyone is talking about is interested in her. At a party Simon sneaks something into Diana’s drink and takes advantage of her while she's intoxicated.
When Diana wakes up again, she discovers something awful: her reflection in the mirror shows an ugly, old woman. A witch. The witch in the mirror takes turns between comforting and yelling at Diana, and the difference between fantasy and reality is slowly dissolved. Diana’s behaviour makes those around her react negatively, and she slowly becomes more and more isolated.

Online Diana looks for answers about what has happened to her and stumbles across an online community that believes witchcraft is real. Diana becomes convinced that she’s made a deal with the Devil himself, after everything that happened with Simon, and she decides to get revenge. But nothing goes according to Diana’s plan.

Sigbjørn Mostue has written a dark and thrilling novel for young adults about the border between superstition, psychosis and intoxication.