Writers of the Future XXVI
After pumping his body with black-market nanodocs, Flynn Mason needs a heart transplant. Dr. Maxwell finds a donor to cure him--only Flynn finds out he’s the one doing the donating: someone’s taking over his body using the transplant to transfer over non-licensed nanotech. They’re rewriting his neurons to turn him into someone else. If this weren’t bad enough, he’s now automatically quarantined as harbored the non-licensed nanotech--not to mention the gun the transplant donor pulls on him.
Impressive biology, thinking out many biological details although it may be unlikely to unfold in this manner. SF is a dialogue, and this one’s worth exploring.