The Quantum Thief is a science fiction novel written by Hannu Rajaniemi. Set in a future where quantum technology has revolutionized 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 complex world of virtual realities, post-human beings, and quantum cryptography, he becomes entangled in a larger conspiracy that could change the fate of humanity. The Quantum Thief is a captivating and mind-bending novel that explores themes of identity, memory, and the nature of reality in a transhumanist future.