What should my book be about

If آپ want your book to be similar to the ones آپ mentioned it would be مزید within the action یا adventure genres. All good stories have romances in them. Not all, but a lot. I think آپ should write whatever آپ feel led closest too and see where it takes you. Who knows, maybe you'll start on a dramatic and action packed romance and it might lead آپ into the characters becoming vampires. And that might only set off the path of starting a series یا trilogy. It all depends on what آپ feel آپ should write. It is your story and your imagination. Let it run free!
I hope I could be of some help. Good luck with your book!!!