What should my book be about

If আপনি want your book to be similar to the ones আপনি mentioned it would be আরো within the action অথবা adventure genres. All good stories have romances in them. Not all, but a lot. I think আপনি should write whatever আপনি 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 আপনি into the characters becoming vampires. And that might only set off the path of starting a series অথবা trilogy. It all depends on what আপনি feel আপনি 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!!!