Books with obvious mistakes reflect poorly on the author as well as the editor and publisher. Editing isn’t so critical if the book is for family and friends only, but it should still at least be checked for hard errors.
The editing process
I will edit your manuscript by correcting and improving the text with attention to grammar, syntax, sentence structure, use of tenses, spelling, punctuation, spacing, choice of vocabulary, handling of direct speech etc and addressing any problems with narrative order, flow, repetition or redundancy, missing detail, contradiction or exposition (how the story is told and information is given). I will also (after checking) correct any apparent factual errors, such as the spellings of place names and geographical, historical or technical details.
I will not make substantial cuts (except to obviously redundant or repetitive passages) without your agreement. I may suggest any additions which would benefit your book, such as an introduction, acknowledgements, dedication, bibliography etc. I will advise you if any passages appear defamatory or otherwise inadvisable.
Fiction
I will edit a work of fiction by improving the text as above and making suggestions about other issues, such as narrative inconsistencies or plot
devices that do not work well or are not credible, missing description or inadequate characterisation. If there are more fundamental issues, eg with the story or characters, which may need further work by yourself before the MS can be finalised, I will advise you on this.