Editors want a story that can be promoted, a story that can grab a reader's attention and make him/her turn the pages. Write the best story you can. Make sure your research is up-to-date. Start with a catchy hook for your story which is a unique angle that relays a fresh approach. Editors are looking for high-concept novels with fresh themes that says, "This is worth reading."
Open the story with a sentence that immediately catches their interest. Then follow up with two hook-laden paragraphs that explain the need to keep the reader turning the page. These elements should indicate the strengths of your story in a nutshell; The central idea of your story. This tells the reader what they will gain by reading your story. Clearly state in your sentence why the reader should care about your story. Millions of readers are hungry for a good story; something they've never heard of before.
Editors will grab your story and run with it and you will be on your way to getting your story published.