The Only Three Questions That Count: Investing by Knowing What Others Don't (Fisher Investments Press)
Ken Fisher
The three questions are:
1. What do you believe that is actually false?
2. How can I fathom what others find unfathomable?
3. What the heck is my brain doing to blindside me now?
Essentially all readily-available information is already priced into the market, but you can leverage patterns that are either not well-known or not widely accepted.