Altered Carbon by Richard Morgan is an excellent sci-fi/cyberpunk novel. If you enjoy cyberpunk, you will enjoy this book.

Takeshi Kovacs is a mercenary brought in from outsystem to solve a perplexing mystery on Earth. He inhabits a strange body, as just his mind (and soul) have been beemed across the cosmic miles. Kovacs has to figure out why a particular man killed himself in six weeks. The man who apparently killed himself is, in fact, the man who hires Kovacs. From hotels run by mischevious AI's to augmented bodies to weapons of the future, Altered Carbon has it all.