Kiln people is a novel in the vein of “classic” sf. Not because it reads as dated, but because it takes an idea and runs with it, asking “what would society be like if X happened? What would be the benefits? What would be the drawbacks?”
Originally published in 2001, it’s part book of ideas, part hardboiled mystery.
Brief plot summary
In the future, disposable, 24-hour bodies are cheap and widely available. Instead of physically going in to work, people upload a copy of their minds into a “ditto” and send it to work in their stead. At the end of the day, the “original” can choose to inload those experiences into their own minds. Albert Morris is a “ditective” (get it? he’s a detective but he uses dittos. Don’t worry, it’s the most forced part of this book). Tasked with solving the murder of a prominent scientist, he and his veritable army of duplicates will face the expected questions of identity and the barrier between “human” and “other”.