What should my book be about

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