It's quite difficult to choose a good book editor as now a day I can see many websites offering book editing services. So you need to see actually which ghostwriter would edit your book. Professional
book editing services also depends on the criteria of the book like the number of pages that is been written and what kind of literature is been used and what you are looking for in return to get edited, Most of the surrounding people to get the book written by themself which takes around 5 to 6 months and then hire a book editors to get there book edited according to the needs