Altered Carbon by Richard Morgan

It's the twenty-fifth century and advances in technology have redefined life itself., A persons consciousness can now be stored in the brain and downloaded into a new body (or ‘sleeve’), reducing death to a minor blip on a screen. Onetime U.N. Envoy Takeshi Kovacs has been killed before, but his last death was particularly painful. Resleeved into a new body un bay City (formerly San Francisco), Kovacs is thrown into  the dark heart of a shady far-reaching conspiracy that is vicious even by the standards of a society that treats existence as something that can be bought and sold, For Kovacs, the shell that blew a hole in his chest was only the beginning.