I wrote an ode to Physics; I narrate the romance with it; I confide how I think about it; I confess my thirst for complete knowledge of its laws; I agonize over when its end will come! In my attempt to understand how the physical world works, I dedicated half of my academic career to research. The other half I devoted to teaching, communicating, and disseminating what I learned.  When I started, three decades ago, I was taught that we were one step away from the end of Physics, a breath away from the Theory of Everything. Today, we are even further from the "thread" we were ready to "cut" thirty years ago. Everything we know today about Physics resembles an island surrounded by the ocean of the unexplored. The physicist's mind is set ablaze when realizing how much more there is to learn.  I did not write this book to narrate the evolution of Physics, nor to envision its future (since I do not know it and suspect that the road will be long). I wrote it because I want to talk to you about what I know we do not know.  I invite you on an insatiable intellectual journey, with stops at the three "pillars" of modern physics: relativity, quantum mechanics, and thermodynamics. And at the end of the journey, the mystery of invisible matter, dark energy, loop quantum gravity, M-theory, and grand unification. What more do you want to feel awe and admiration? But, is it possible for someone not to love Physics?  The triumph of Physics, through the eyes of the most talented, the most inspired, the most informed popularizer of science.                    (Ian Stewart)  A book-call to young people (undecided or hesitant) who are considering getting involved with Physics. Jim Al-Khalili encourages them in his own unique way to embark on this very challenging mission. (The Best Science Books of 2020)  The charm of the book is that it keeps open the sense of wonder, discovery, and the possibility that we all have, even non-specialist readers (and let's admit it, that's where most of us belong) to enjoy the magic and future of Physics.              (The Royal Society Science Book Prize)