The Quantum Thief is a science fiction novel written by Hannu Rajaniemi. Set in a future where quantum technology has transformed society, the story follows a master thief named Jean le Flambeur. Jean is released from prison to complete a seemingly impossible heist, but soon finds himself caught in a web of intrigue involving virtual realities and ancient secrets. The Quantum Thief is known for its complex world-building and mind-bending concepts.