The best book I have ever read in my life is a textbook. (Yes, really!)
"How to think straight about psychology" by Keith E. Stanovich, it could easily be called "How to think straight about science" My perceptions about almost everything changed, it truly was a fascinating process, so simple so clear and so accurate! I wish I could persuade medics to read it. I did write to Professor Stanovich & ask him to re-package it as a book for medics :D
"How to think straight about medicine" it could work! Maybe as pre-reading.