Bus in Trouble

Publisher's blurb:

When we got into the vehicle, the driver greeted us with a discreet nod. His rigid expression spoke volumes. He was probably wondering what we, the people from the city, were doing crossing this lost region. The trip was going to last almost 4 hours, 4 hours of nightmare, hemmed in by the tortuous and bumpy roads. But that wasn't the worst of it, the fog had caught up with us when we were halfway to our destination, and as we started to turn a corner, something heavy and massive hit the back of our bus...