A snippet of the review from The Guardian: "Whatever else Aldiss may be, predictable he is not."
Well, it's easy to be unpredictable when your characters don't act like people, when no one reacts the way a logical person reacts, when the characters do what they do because that's what the plot needs them to. A ghost train whisks by without any explanation: obviously the next course of action is to try to board it without any preliminary investigation. Let's bring the newlywed couple who are about to go on their honeymoon to this archaeological dig that they really don't have any interest in; seems reasonable. That newlywed couple will then spend the whole book fighting, but their fights are crazy inconsistent and they flip flop which side they're on each argument. Several horrific things happen, and the characters just brush it off; gotta move on to the next scene. Keep the plot moving guys.
The plot moves so quickly from scene to scene, there's no opportunity for anything that happens to really settle, to have any impact, and the progression makes absolutely no sense. And since the characters aren't feeling anything, the reader can't either. And for a story about time travel, not a lot of play is done with the time travel element. Time may be wibbly wobbly, but it's not in Aldiss's story. The plot goes from A to B to C, and so on, M to N...back to M, but not farther, to N to O to P to O...to P to Q, etc.
If I finish a book, I usually give at least 2 stars; 3 generally means, "this was a book that was fine." But I just can't give this more than 1 star. The story was drab, the characters were unbelievable even as cardboard cutouts, there was no play with time travel fun (which was the main reason I kept reading; what kind of time travel doesn't include some kind of twisty element??).
The one positive: I like this world's vampire lore/history...