warning: reading this might cost you your life

I tried finding a book today but I don't know which one it is. My mom said she was reading a book called "Radical christianity" or something like that, and said it was out of print but she got it cheap, usually it's $70 or so but she got it for $2. On the back there is a white box that says "Warning: reading this might cost you your life."

But I looked everywhere and can't find the right one yet. She said it's about different people? or those who commit themselves to God, regardless of outcome.

For me I thought, "Actually, I should stay off of the internet and t.v. more. It's an easy way for people to track you down when you're traveling, though I can't seem to travel incognito anymore."