Make the 500 word story engaging, fascinating and adrenaline rushing!

I have a 500 word thriller novel. I would like to engage a native English speaking individual who is skilled in the English language (American style preferred) to edit the story. The word version of the manuscript will be passed to the selected individual for this project. Interested candidates should have a bachelor's degree or higher in English language or relevant arts and have sufficient experience doing similar works in the past. I will require you to improve on the language of the story and make it stronger and more appealing to the reader. You may change the sentence structure, cut down on excessive words and do anything else you need to make the story fast paced, action packed and adrenaline rushing. Essentially, I want the reader to remain glued to the book once he starts reading it and will only stop because it's the end of the story. Also, take note that the end product has to be free from grammatical errors and good enough for publication. Take note that the book contains strong language. Rates are negotiable.