Scientific Speculation - The Paradox Men

In Charles L Harness's 'The Paradox Men', a spaceship crashes on earth several years before it launches, having circumnavigated the universe faster than the speed of light. It is a good read, but I would like to be able, as far as possible, to defend that central structure and help people suspend their disbelief even if they know a lot of physics. Unfortunately I'm pretty out of my depth with the relationship between relativity and cosmology.

My current best attempt would be something like this: The cosmic microwave background is the most distant evidence, and the most redshifted, that the boundary of our universe is what is moving away from us at the speed of light. The boundary of our universe is also t=0. If we can travel faster than light, we blue-shift that as we accelerate until finally its the big bang and we smash through it ...Thats it... Beyond that I can only see even more fanciful handwaving. Anyone have a suggestion?

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