A spaceship returns from a scientific mission to find 400 years have past and that a terrible disaster has happened.
It's tricky to write a review of this book without spoilers so don't read further if you don't want to know more.
The style is good, it's very readable, the characters are interesting and clearly defined. Lots of exciting things happen and there is plenty of murder and mayhem. As Europe has regressed to hunter gatherer level, pre-horse and dog taming and pre bow culture the spacemen try to survive and introduce innovation and use their skills to survive and make their niche. Many of the local tribes are savage and the spacemen lose a fair number of people pretty fast. All through the book I was waiting for these eminent scientists and in one case blacksmith skilled guys to settle down, make a waterwheel and mill and move things up by several hundred or thousand years, but they are much more laid back than that and their major innovations are small and by the end hardly any are even used any more, but their arrival has improved the lot of the tribe and made them powerful.
One of the decisions in the book that was made that caused a disaster was ludicrous and hard for me to understand why it had been made, that action had a number of long reaching consequences that lead to the main character sulking for the next god knows how many years and basically doing nothing and things regressed.
Not every book can be like a Connecticut Yankee with its rapid innovation but I found this book a little disappointing despite having enjoyed it, they could have done so much more. If you like space time stories, tribal warfare, food gathering, cattle and women stealing and following the group as they wander around post apocalyptic tribal France and England then this is for you.