I love the "off-the-page" opportunities afforded to books. New things are happening every day! But I never lose sight (as I hope you don't either) of the fact that books are first and foremost about writing. Writing stories.
These stories might take different forms: images, video, etc. etc. etc...but they are first of all stories. And there are some things about writing stories that will never change.
Stories have to have good pace. The characters have to feel real and deep. The tone has to fit the subject matter. The writing has to be beautiful or fantastic or funny or lively enough to pull someone all the way through your thriller.
All those things take a lot of editing. These will never ever come together all on the first go. And the one universal truth about editing is that you can't edit yourself. Just trust me. You can't!
You're too close to the writing and to the story. Meaning it all makes sense to you because you conceived it all. But how about what your readers will perceive? The only way to find out is to have readers read it.
Please, please get Beta Readers. Please get them before you query me and please listen to them. If they tell you to change something, consider it! If they tell you something and then it's corroborated, REALLY consider making the change. If nothing else, it'll be good for you to feel what it's like to change something because others perceived a flaw--something you'll be doing a lot of if you get agented and get an editor.
Don't know how to find Betas? Leave a comment with your genre and category and we'll see what we can do here for ya. Got opinions about Betas? Leave those too!