Quantum Theory: A Very Short Introduction by John Polkinghorne

Very good, concise, well-written. What limited math it has is less accessible to me because of typography or symbols that either are beyond me or different than what I have studied. He gives care to state that drawing philosophical conclusions from physics is not warranted - he calls this Quantum Hype. "...random subatomic uncertainty is very different indeed from the exercise of the free will of an agent."