I recommend the book The Road to Reality: A Complete Guide to the Laws of the Universe by Roger Penrose.
It tries to touch almost all areas in physics, including the hot ones. Penrose emphasizes the mathematical part (especially the geometric interpretations), and avoids to be superficial (many scientific writers, when trying to make the things easier, use misleading metaphors). One warning is to be careful that sometimes he expresses his personal viewpoint, which is not always mainstream. But it is clear when he does this, and he is very careful to make justice to the mainstream viewpoint, by presenting it very well.
This book is indeed a road map to modern physics, and I recommend to anyone interested in this area to read it at least once, and then to consult the chapters of interest as they need.
