Why the title? Simply because when I was 60, I wanted to spend a few weeks travelling route 66, which, for various reasons did not materialise, then recently I watched a TV cookery programme where the presenters/cooks were travelling route 66 as I was typing some notes for this book - and I thought about adding an additional 6 to the famous route. Hopefully no one will think this is a travel book wondering where route 666 is, as it is not a route that we should desire. This book follows the route that Lucifer took, from his creation onwards - travelling the road to Hell. (NB There have been many debates as to what this number means and whether it is in fact 666, but such a debate is not covered by this book. Neither will I be referring to whether 666 is a real, physical mark of the beast, which some believe will be tattooed on people's foreheads. Keep such images for Hollywood!) This is but a small offering on a vast topic. As with any of my books, there are eloquent, academic alternative tomes available on Satan/the devil, but I aim to narrow down the questions, theories, and debates to a basic, hopefully understandable, though not necessarily agreeable, version. I have attempted to capture the main points under three main headings: his beginnings, his mission, and his demise.