Gil 'The Arm' Hamilton has a telekinetic third arm due to an accident in his past. He is one of the agent of ARM, comparable with present day FBI, but a great deal bigger. One of the most important tasks of the ARM is to combat organlegging, the illegal organ transplants and the resultant kidnapping of 'transplantmaterial'.

Niven writes a series of stories featuring this character that sketch a very unsettling glimpse of the future. A future where people will literally do anything to extend their lives. Criminals that get the death penalty go to the organ banks and you can go there for tax-evasion. But even with this there are not enough organs...
Frightening realistic. First time I read this I found it a good series of mysteries, the second time I found it a terrifying prospect of the future. Some of this already happens in China where organs are used from criminals who got the deathsentence, so this already happens... ( )