Stu Perrins 
Clockwork Inc. [EPUB ebook] 

Honest, trustworthy, hardworking. These are just three words that have never been used to describe Roger Hanover. He is a man who sees Black Holes and parallel universes as avenues to make a quick buck rather than gateways into the unknown. Roger soon finds out the hard way that living in multiple time lines isn’t the fun and games he thought it would be.