The tone was great but also put me off at the same time - but it takes a complicated subject matter and uses very simple language a lot of very easy metaphors to explain it. A lot of the nitty gritty wasn't super interesting to me, but it's nice to have some knowledge about how the individual parts of the immune system work. I did enjoy the chapters in the later part of the book a lot more. There's also some fun facts about the history of vaccines (which involved treating syphilis with malaria), diseases like measles (which destroys cells that hold the history of your immunity to other diseases), why we have more allergies or autoimmune diseases, and bunch of other topics. It was worth picking up!