Questions free will (or absense of) in 3 aspects: Physiology (e.g. choice to produce red blood cells, etc.), Emotions (e.g. how some studies show that physical changes in your body dictate the emotions you feel not the other way around, etc.) and Beliefs (e.g. environmental factors like what you read, who you hang out with, etc.).
Includes a very interesting Sam Harris clip in which he says: "... from the perspective of your conscious mind, you're no more responsible for your next thought ..."