Bitcoin For Blockheads by Tasheme Thomas is a very informative book on the concept of bitcoin and the blockchain technology.
As someone who had almost no idea about what bitcoin was and the things it entailed, I am really glad that I read this book. It was an easy read and presented all the concepts very clearly and in a very understandable way. The content itself felt rich and even if I wouldn't have been able to grasp the context of everything described in the book, I know a LOT more about Bitcoin than I ever did before! The best part was that the book was very short, so I did not find myself wandering even for a second, as generally happens in case of technical books.
I'd recommend it to everyone who is interested in bitcoin and wants to know more about the subject in under an hour.