A Scanner Darkly

Set in a near future now past this almost feels like nostalgia for the late '60s or early '70s. Bob Arctor and his friends spend their time getting wasted and stoned and admiring the groovy girls who aren't wearing bras under their tank tops. However Bob isn't really Bob, he's Fred an undercover narcotics agent. Fred is investigating who is behind Substance D that is slowly destroying the brains of these mellow druggies. Can Bob/Fred stay undercover and find out or will Substance D ruin him too? The book takes a twist towards the end that I'd forgotten and the Author's Note is genuinely heartbreaking. I'm really glad I gave it a re-read.