The Quantum Magician by Derek Künsten is £0.99 at Amazon UK today.
It's a novel that was serialised in Analog SFF (I think it was Analog). A con job with a background of a fractured humanity, and some nods to Quantum Theory (although the use they make of entangled particles isn't possible, as far as we know.)
I'm reading it at the moment, having bought it last month for £1.99!