This is a good introduction to the origins and content of the US Constitution. It is a simple book that you can finish in a few hours. Almost a high school-level text, it reads like something from your civics class, sprinkled with brief discussions of current topics like the Administrative State and Originalism versus Living Constitutionalism. It refers to the Federalist papers many times but reading this is certainly less effort than reading the Federalist papers.
One criticism might be what appears to be a subtitle (Values and Capitalism) but actually refers to a project by the American Enterprise Institute, which created the book. Values and capitalism are not really discussed much. In fact I found the word capitalism used only once in the book. It makes you think the book might be some sort of right-wing Tome but in fact it didn't seem that way at all to me. I'm afraid that might dissuade some readers from taking on this simple educational primer.
The book has a list of suggestions for further reading at the end. I recommend it for anyone who is trying to learn more about our constitution.