You've Got To Laugh Haven't You?
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For more on marking an answer as the "Best Answer", please visit our FAQ.Time Machines: Time Travel in Physics, Metaphysics and Science Fiction is quite good in that it examines how science fiction writers explain away the nuances of time travel, then it examines the actualities of time travel in some detail (though not above degree level). Baked my noodle!
If you want the real heavy brigade Roger Penrose's "the road to reality" http://www.amazon.co.uk/exec/obidos/ASIN/0224044478/203-5222962-6787169
I've been working through this book for a few years. It starts with topics like complex numbers, Riemann surfaces and goes on to string and twistor theory.
It has a heavy maths content but is not for professional mathematicians.
If he's already whipped through things like "A brief history" it should do the job!
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