Jam Al-Khalili: Quantum, A Guide for the Perplexed
Quantum is the world so small that we can not see it, but we have a good explanation of it already. The book is a good overview of what we know.
Richard P. Feynman: Six Easy Pieces
Feynman's physics lectures are worth reading, not only listening. He tried to bring complex world of physics into simple reality for students to understand it.