The book explores what defines human identity when physical bodies become interchangeable, following Takeshi Kovacs as he grapples with his sense of self after centuries in digital storage and experiences in different bodies.

Immortality technology widens the gap between rich and poor, as only the wealthy can afford new young bodies, leading to increased social tensions and widespread corruption among those who no longer fear death.

The novel examines ethical implications of immortality technology, questioning the morality of body switching and how the prospect of eternal life affects human moral values.