A very good book on the zero-day market (amongst other topics) is 2021's This Is How They Tell Me The World Ends: https://thisishowtheytellmetheworldends.com/
Well, not anymore
A very good book on the zero-day market (amongst other topics) is 2021's This Is How They Tell Me The World Ends: https://thisishowtheytellmetheworldends.com/