The Quantum Thief, written by Hannu Rajaniemi, is a science fiction novel set in a future where quantum technology has transformed society. The story follows Jean le Flambeur, a master thief who is broken out of prison to complete a seemingly impossible heist. As Jean navigates a world of virtual realities and post-human beings, he becomes entangled in a larger conflict that could change the fate of humanity. The Quantum Thief explores themes of transhumanism, identity, and the nature of reality.