Lately I've been trying to remember a book I read a while ago, about a group of time-traveling vampires and (possibly) including the one and only Count Dracula himself.
The book was written in English by an American author probably in the 80s, but I read it around the mid-90s. It was a paperback with around 200+ pages or so and if I remember correctly, the version that I had, had a red cover.
The story is that vampires really do exist in our society and they really fear the sign of the cross and daylight. However, due to the modern surveillance and policing methods of our society, feeding unobserved is becoming more and more difficult, thus being led to extinction as they are also hunted by the Van Helsing family (descendants of the famous vampire hunter of the original Bram Stoker story).
Some time in the near future only a handful of them are left and are led by the Count himself. At the same time, a scientist makes a time-machine and becomes an instant celebrity in the news. In a desperate attempt, the Count and his team attempt a series of heists: First they steal a few nuclear bombs from a nearby base and then the time-machine itself, with the goal to travel back to the Stone Age when humans are not a threat and explode the bombs to make a nuclear winter, thus walking the Earth unmolested and enslaving the humans of the time, so as to keep them as cattle.
However, at the very last minute they are stopped by our hero (a Van Helsing of course), albeit, with him and his love interest being stuck in the stone Age with the last few of the vampires, thus starting the cycle once again. Finally, one of the bombs exploded and the mushroom cloud and the bright flash cause the vampires' fear of light and the cross.
I tried to provide as many details as possible, but my google-fu is giving me lots of irrelevant results due to the terms time-travel, Dracula, vampires etc, and I may be confusing some of the details with other stories, so my apologies. Any help is appreciated!